text: /*
     +----------------------------------------------------------------------+
     | Copyright (c) The PHP Group                                          |
     +----------------------------------------------------------------------+
     | This source file is subject to version 3.01 of the PHP license,      |
     | that is bundled with this package in the file LICENSE, and is        |
     | available through the world-wide-web at the following url:           |
     | https://www.php.net/license/3_01.txt                                 |
     | If you did not receive a copy of the PHP license and are unable to   |
     | obtain it through the world-wide-web, please send a note to          |
     | license@php.net so we can mail you a copy immediately.               |
     +----------------------------------------------------------------------+
     | Authors: Jani Lehtimäki <jkl@njet.net>                               |
     |          Thies C. Arntzen <thies@thieso.net>                         |
     |          Sascha Schumann <sascha@schumann.cx>                        |
     +----------------------------------------------------------------------+
  */
  
  /* {{{ includes */
  #include <stdio.h>
  #include <stdlib.h>
  #include <errno.h>
  #include "php.h"
  #include "php_string.h"
  #include "php_var.h"
  #include "zend_smart_str.h"
  #include "basic_functions.h"
  #include "php_incomplete_class.h"
  #include "zend_enum.h"
  #include "zend_exceptions.h"
  /* }}} */
  
  struct php_serialize_data {
  	HashTable ht;
  	uint32_t n;
  };
  
  #define COMMON (is_ref ? "&" : "")
  
  static void php_array_element_dump(zval *zv, zend_ulong index, zend_string *key, int level) /* {{{ */
  {
  	if (key == NULL) { /* numeric key */
  		php_printf("%*c[" ZEND_LONG_FMT "]=>\n", level + 1, ' ', index);
  	} else { /* string key */
  		php_printf("%*c[\"", level + 1, ' ');
  		PHPWRITE(ZSTR_VAL(key), ZSTR_LEN(key));
  		php_printf("\"]=>\n");
  	}
  	php_var_dump(zv, level + 2);
  }
  /* }}} */
  
  static void php_object_property_dump(zend_property_info *prop_info, zval *zv, zend_ulong index, zend_string *key, int level) /* {{{ */
  {
  	const char *prop_name, *class_name;
  
  	if (key == NULL) { /* numeric key */
  		php_printf("%*c[" ZEND_LONG_FMT "]=>\n", level + 1, ' ', index);
  	} else { /* string key */
  		int unmangle = zend_unmangle_property_name(key, &class_name, &prop_name);
  		php_printf("%*c[", level + 1, ' ');
  
  		if (class_name && unmangle == SUCCESS) {
  			if (class_name[0] == '*') {
  				php_printf("\"%s\":protected", prop_name);
  			} else {
  				php_printf("\"%s\":\"%s\":private", prop_name, class_name);
  			}
  		} else {
  			php_printf("\"");
  			PHPWRITE(ZSTR_VAL(key), ZSTR_LEN(key));
  			php_printf("\"");
  		}
  		ZEND_PUTS("]=>\n");
  	}
  
  	if (Z_TYPE_P(zv) == IS_UNDEF) {
  		ZEND_ASSERT(ZEND_TYPE_IS_SET(prop_info->type));
  		zend_string *type_str = zend_type_to_string(prop_info->type);
  		php_printf("%*cuninitialized(%s)\n",
  			level + 1, ' ', ZSTR_VAL(type_str));
  		zend_string_release(type_str);
  	} else {
  		php_var_dump(zv, level + 2);
  	}
  }
  /* }}} */
  
  PHPAPI void php_var_dump(zval *struc, int level) /* {{{ */
  {
  	HashTable *myht;
  	zend_string *class_name;
  	int is_ref = 0;
  	zend_ulong num;
  	zend_string *key;
  	zval *val;
  	uint32_t count;
  
  	if (level > 1) {
  		php_printf("%*c", level - 1, ' ');
  	}
  
  again:
  	switch (Z_TYPE_P(struc)) {
  		case IS_FALSE:
  			php_printf("%sbool(false)\n", COMMON);
  			break;
  		case IS_TRUE:
  			php_printf("%sbool(true)\n", COMMON);
  			break;
  		case IS_NULL:
  			php_printf("%sNULL\n", COMMON);
  			break;
  		case IS_LONG:
  			php_printf("%sint(" ZEND_LONG_FMT ")\n", COMMON, Z_LVAL_P(struc));
  			break;
  		case IS_DOUBLE:
  			php_printf_unchecked("%sfloat(%.*H)\n", COMMON, (int) PG(serialize_precision), Z_DVAL_P(struc));
  			break;
  		case IS_STRING:
  			php_printf("%sstring(%zd) \"", COMMON, Z_STRLEN_P(struc));
  			PHPWRITE(Z_STRVAL_P(struc), Z_STRLEN_P(struc));
  			PUTS("\"\n");
  			break;
  		case IS_ARRAY:
  			myht = Z_ARRVAL_P(struc);
  			if (!(GC_FLAGS(myht) & GC_IMMUTABLE)) {
  				if (GC_IS_RECURSIVE(myht)) {
  					PUTS("*RECURSION*\n");
  					return;
  				}
  				GC_ADDREF(myht);
  				GC_PROTECT_RECURSION(myht);
  			}
  			count = zend_hash_num_elements(myht);
  			php_printf("%sarray(%d) {\n", COMMON, count);
  			ZEND_HASH_FOREACH_KEY_VAL(myht, num, key, val) {
  				php_array_element_dump(val, num, key, level);
  			} ZEND_HASH_FOREACH_END();
  			if (!(GC_FLAGS(myht) & GC_IMMUTABLE)) {
  				GC_UNPROTECT_RECURSION(myht);
  				GC_DELREF(myht);
  			}
  			if (level > 1) {
  				php_printf("%*c", level-1, ' ');
  			}
  			PUTS("}\n");
  			break;
  		case IS_OBJECT: {
  			zend_class_entry *ce = Z_OBJCE_P(struc);
  			if (ce->ce_flags & ZEND_ACC_ENUM) {
  				zval *case_name_zval = zend_enum_fetch_case_name(Z_OBJ_P(struc));
  				php_printf("%senum(%s::%s)\n", COMMON, ZSTR_VAL(ce->name), Z_STRVAL_P(case_name_zval));
  				return;
  			}
  
  			if (Z_IS_RECURSIVE_P(struc)) {
  				PUTS("*RECURSION*\n");
  				return;
  			}
  			Z_PROTECT_RECURSION_P(struc);
  
  			myht = zend_get_properties_for(struc, ZEND_PROP_PURPOSE_DEBUG);
  			class_name = Z_OBJ_HANDLER_P(struc, get_class_name)(Z_OBJ_P(struc));
  			php_printf("%sobject(%s)#%d (%d) {\n", COMMON, ZSTR_VAL(class_name), Z_OBJ_HANDLE_P(struc), myht ? zend_array_count(myht) : 0);
  			zend_string_release_ex(class_name, 0);
  
  			if (myht) {
  				zend_ulong num;
  				zend_string *key;
  				zval *val;
  
  				ZEND_HASH_FOREACH_KEY_VAL(myht, num, key, val) {
  					zend_property_info *prop_info = NULL;
  
  					if (Z_TYPE_P(val) == IS_INDIRECT) {
  						val = Z_INDIRECT_P(val);
  						if (key) {
  							prop_info = zend_get_typed_property_info_for_slot(Z_OBJ_P(struc), val);
  						}
  					}
  
  					if (!Z_ISUNDEF_P(val) || prop_info) {
  						php_object_property_dump(prop_info, val, num, key, level);
  					}
  				} ZEND_HASH_FOREACH_END();
  				zend_release_properties(myht);
  			}
  			if (level > 1) {
  				php_printf("%*c", level-1, ' ');
  			}
  			PUTS("}\n");
  			Z_UNPROTECT_RECURSION_P(struc);
  			break;
  		}
  		case IS_RESOURCE: {
  			const char *type_name = zend_rsrc_list_get_rsrc_type(Z_RES_P(struc));
  			php_printf("%sresource(%d) of type (%s)\n", COMMON, Z_RES_P(struc)->handle, type_name ? type_name : "Unknown");
  			break;
  		}
  		case IS_REFERENCE:
  			//??? hide references with refcount==1 (for compatibility)
  			if (Z_REFCOUNT_P(struc) > 1) {
  				is_ref = 1;
  			}
  			struc = Z_REFVAL_P(struc);
  			goto again;
  			break;
  		default:
  			php_printf("%sUNKNOWN:0\n", COMMON);
  			break;
  	}
  }
  /* }}} */
  
  /* {{{ Dumps a string representation of variable to output */
  PHP_FUNCTION(var_dump)
  {
  	zval *args;
  	int argc;
  	int	i;
  
  	ZEND_PARSE_PARAMETERS_START(1, -1)
  		Z_PARAM_VARIADIC('+', args, argc)
  	ZEND_PARSE_PARAMETERS_END();
  
  	for (i = 0; i < argc; i++) {
  		php_var_dump(&args[i], 1);
  	}
  }
  /* }}} */
  
  static void zval_array_element_dump(zval *zv, zend_ulong index, zend_string *key, int level) /* {{{ */
  {
  	if (key == NULL) { /* numeric key */
  		php_printf("%*c[" ZEND_LONG_FMT "]=>\n", level + 1, ' ', index);
  	} else { /* string key */
  		php_printf("%*c[\"", level + 1, ' ');
  		PHPWRITE(ZSTR_VAL(key), ZSTR_LEN(key));
  		php_printf("\"]=>\n");
  	}
  	php_debug_zval_dump(zv, level + 2);
  }
  /* }}} */
  
  static void zval_object_property_dump(zend_property_info *prop_info, zval *zv, zend_ulong index, zend_string *key, int level) /* {{{ */
  {
  	const char *prop_name, *class_name;
  
  	if (key == NULL) { /* numeric key */
  		php_printf("%*c[" ZEND_LONG_FMT "]=>\n", level + 1, ' ', index);
  	} else { /* string key */
  		zend_unmangle_property_name(key, &class_name, &prop_name);
  		php_printf("%*c[", level + 1, ' ');
  
  		if (class_name) {
  			if (class_name[0] == '*') {
  				php_printf("\"%s\":protected", prop_name);
  			} else {
  				php_printf("\"%s\":\"%s\":private", prop_name, class_name);
  			}
  		} else {
  			php_printf("\"%s\"", prop_name);
  		}
  		ZEND_PUTS("]=>\n");
  	}
  	if (prop_info && Z_TYPE_P(zv) == IS_UNDEF) {
  		zend_string *type_str = zend_type_to_string(prop_info->type);
  		php_printf("%*cuninitialized(%s)\n",
  			level + 1, ' ', ZSTR_VAL(type_str));
  		zend_string_release(type_str);
  	} else {
  		php_debug_zval_dump(zv, level + 2);
  	}
  }
  /* }}} */
  
  PHPAPI void php_debug_zval_dump(zval *struc, int level) /* {{{ */
  {
  	HashTable *myht = NULL;
  	zend_string *class_name;
  	zend_ulong index;
  	zend_string *key;
  	zval *val;
  	uint32_t count;
  
  	if (level > 1) {
  		php_printf("%*c", level - 1, ' ');
  	}
  
  	switch (Z_TYPE_P(struc)) {
  	case IS_FALSE:
  		PUTS("bool(false)\n");
  		break;
  	case IS_TRUE:
  		PUTS("bool(true)\n");
  		break;
  	case IS_NULL:
  		PUTS("NULL\n");
  		break;
  	case IS_LONG:
  		php_printf("int(" ZEND_LONG_FMT ")\n", Z_LVAL_P(struc));
  		break;
  	case IS_DOUBLE:
  		php_printf_unchecked("float(%.*H)\n", (int) PG(serialize_precision), Z_DVAL_P(struc));
  		break;
  	case IS_STRING:
  		php_printf("string(%zd) \"", Z_STRLEN_P(struc));
  		PHPWRITE(Z_STRVAL_P(struc), Z_STRLEN_P(struc));
  		if (Z_REFCOUNTED_P(struc)) {
  			php_printf("\" refcount(%u)\n", Z_REFCOUNT_P(struc));
  		} else {
  			PUTS("\" interned\n");
  		}
  		break;
  	case IS_ARRAY:
  		myht = Z_ARRVAL_P(struc);
  		if (!(GC_FLAGS(myht) & GC_IMMUTABLE)) {
  			if (GC_IS_RECURSIVE(myht)) {
  				PUTS("*RECURSION*\n");
  				return;
  			}
  			GC_ADDREF(myht);
  			GC_PROTECT_RECURSION(myht);
  		}
  		count = zend_hash_num_elements(myht);
  		if (Z_REFCOUNTED_P(struc)) {
  			/* -1 because of ADDREF above. */
  			php_printf("array(%d) refcount(%u){\n", count, Z_REFCOUNT_P(struc) - 1);
  		} else {
  			php_printf("array(%d) interned {\n", count);
  		}
  		ZEND_HASH_FOREACH_KEY_VAL(myht, index, key, val) {
  			zval_array_element_dump(val, index, key, level);
  		} ZEND_HASH_FOREACH_END();
  		if (!(GC_FLAGS(myht) & GC_IMMUTABLE)) {
  			GC_UNPROTECT_RECURSION(myht);
  			GC_DELREF(myht);
  		}
  		if (level > 1) {
  			php_printf("%*c", level - 1, ' ');
  		}
  		PUTS("}\n");
  		break;
  	case IS_OBJECT:
  		myht = zend_get_properties_for(struc, ZEND_PROP_PURPOSE_DEBUG);
  		if (myht) {
  			if (GC_IS_RECURSIVE(myht)) {
  				PUTS("*RECURSION*\n");
  				zend_release_properties(myht);
  				return;
  			}
  			GC_PROTECT_RECURSION(myht);
  		}
  		class_name = Z_OBJ_HANDLER_P(struc, get_class_name)(Z_OBJ_P(struc));
  		php_printf("object(%s)#%d (%d) refcount(%u){\n", ZSTR_VAL(class_name), Z_OBJ_HANDLE_P(struc), myht ? zend_array_count(myht) : 0, Z_REFCOUNT_P(struc));
  		zend_string_release_ex(class_name, 0);
  		if (myht) {
  			ZEND_HASH_FOREACH_KEY_VAL(myht, index, key, val) {
  				zend_property_info *prop_info = NULL;
  
  				if (Z_TYPE_P(val) == IS_INDIRECT) {
  					val = Z_INDIRECT_P(val);
  					if (key) {
  						prop_info = zend_get_typed_property_info_for_slot(Z_OBJ_P(struc), val);
  					}
  				}
  
  				if (!Z_ISUNDEF_P(val) || prop_info) {
  					zval_object_property_dump(prop_info, val, index, key, level);
  				}
  			} ZEND_HASH_FOREACH_END();
  			GC_UNPROTECT_RECURSION(myht);
  			zend_release_properties(myht);
  		}
  		if (level > 1) {
  			php_printf("%*c", level - 1, ' ');
  		}
  		PUTS("}\n");
  		break;
  	case IS_RESOURCE: {
  		const char *type_name = zend_rsrc_list_get_rsrc_type(Z_RES_P(struc));
  		php_printf("resource(%d) of type (%s) refcount(%u)\n", Z_RES_P(struc)->handle, type_name ? type_name : "Unknown", Z_REFCOUNT_P(struc));
  		break;
  	}
  	case IS_REFERENCE:
  		php_printf("reference refcount(%u) {\n", Z_REFCOUNT_P(struc));
  		php_debug_zval_dump(Z_REFVAL_P(struc), level + 2);
  		if (level > 1) {
  			php_printf("%*c", level - 1, ' ');
  		}
  		PUTS("}\n");
  		break;
  	default:
  		PUTS("UNKNOWN:0\n");
  		break;
  	}
  }
  /* }}} */
  
  /* {{{ Dumps a string representation of an internal zend value to output. */
  PHP_FUNCTION(debug_zval_dump)
  {
  	zval *args;
  	int argc;
  	int	i;
  
  	ZEND_PARSE_PARAMETERS_START(1, -1)
  		Z_PARAM_VARIADIC('+', args, argc)
  	ZEND_PARSE_PARAMETERS_END();
  
  	for (i = 0; i < argc; i++) {
  		php_debug_zval_dump(&args[i], 1);
  	}
  }
  /* }}} */
  
  #define buffer_append_spaces(buf, num_spaces) \
  	do { \
  		char *tmp_spaces; \
  		size_t tmp_spaces_len; \
  		tmp_spaces_len = spprintf(&tmp_spaces, 0,"%*c", num_spaces, ' '); \
  		smart_str_appendl(buf, tmp_spaces, tmp_spaces_len); \
  		efree(tmp_spaces); \
  	} while(0);
  
  static void php_array_element_export(zval *zv, zend_ulong index, zend_string *key, int level, smart_str *buf) /* {{{ */
  {
  	if (key == NULL) { /* numeric key */
  		buffer_append_spaces(buf, level+1);
  		smart_str_append_long(buf, (zend_long) index);
  		smart_str_appendl(buf, " => ", 4);
  
  	} else { /* string key */
  		zend_string *tmp_str;
  		zend_string *ckey = php_addcslashes(key, "'\\", 2);
  		tmp_str = php_str_to_str(ZSTR_VAL(ckey), ZSTR_LEN(ckey), "\0", 1, "' . \"\\0\" . '", 12);
  
  		buffer_append_spaces(buf, level + 1);
  
  		smart_str_appendc(buf, '\'');
  		smart_str_append(buf, tmp_str);
  		smart_str_appendl(buf, "' => ", 5);
  
  		zend_string_free(ckey);
  		zend_string_free(tmp_str);
  	}
  	php_var_export_ex(zv, level + 2, buf);
  
  	smart_str_appendc(buf, ',');
  	smart_str_appendc(buf, '\n');
  }
  /* }}} */
  
  static void php_object_element_export(zval *zv, zend_ulong index, zend_string *key, int level, smart_str *buf) /* {{{ */
  {
  	buffer_append_spaces(buf, level + 2);
  	if (key != NULL) {
  		const char *class_name, *prop_name;
  		size_t prop_name_len;
  		zend_string *pname_esc;
  
  		zend_unmangle_property_name_ex(key, &class_name, &prop_name, &prop_name_len);
  		pname_esc = php_addcslashes_str(prop_name, prop_name_len, "'\\", 2);
  
  		smart_str_appendc(buf, '\'');
  		smart_str_append(buf, pname_esc);
  		smart_str_appendc(buf, '\'');
  		zend_string_release_ex(pname_esc, 0);
  	} else {
  		smart_str_append_long(buf, (zend_long) index);
  	}
  	smart_str_appendl(buf, " => ", 4);
  	php_var_export_ex(zv, level + 2, buf);
  	smart_str_appendc(buf, ',');
  	smart_str_appendc(buf, '\n');
  }
  /* }}} */
  
  PHPAPI void php_var_export_ex(zval *struc, int level, smart_str *buf) /* {{{ */
  {
  	HashTable *myht;
  	char tmp_str[PHP_DOUBLE_MAX_LENGTH];
  	zend_string *ztmp, *ztmp2;
  	zend_ulong index;
  	zend_string *key;
  	zval *val;
  
  again:
  	switch (Z_TYPE_P(struc)) {
  		case IS_FALSE:
  			smart_str_appendl(buf, "false", 5);
  			break;
  		case IS_TRUE:
  			smart_str_appendl(buf, "true", 4);
  			break;
  		case IS_NULL:
  			smart_str_appendl(buf, "NULL", 4);
  			break;
  		case IS_LONG:
  			/* INT_MIN as a literal will be parsed as a float. Emit something like
  			 * -9223372036854775807-1 to avoid this. */
  			if (Z_LVAL_P(struc) == ZEND_LONG_MIN) {
  				smart_str_append_long(buf, ZEND_LONG_MIN+1);
  				smart_str_appends(buf, "-1");
  				break;
  			}
  			smart_str_append_long(buf, Z_LVAL_P(struc));
  			break;
  		case IS_DOUBLE:
  			php_gcvt(Z_DVAL_P(struc), (int)PG(serialize_precision), '.', 'E', tmp_str);
  			smart_str_appends(buf, tmp_str);
  			/* Without a decimal point, PHP treats a number literal as an int.
  			 * This check even works for scientific notation, because the
  			 * mantissa always contains a decimal point.
  			 * We need to check for finiteness, because INF, -INF and NAN
  			 * must not have a decimal point added.
  			 */
  			if (zend_finite(Z_DVAL_P(struc)) && NULL == strchr(tmp_str, '.')) {
  				smart_str_appendl(buf, ".0", 2);
  			}
  			break;
  		case IS_STRING:
  			ztmp = php_addcslashes(Z_STR_P(struc), "'\\", 2);
  			ztmp2 = php_str_to_str(ZSTR_VAL(ztmp), ZSTR_LEN(ztmp), "\0", 1, "' . \"\\0\" . '", 12);
  
  			smart_str_appendc(buf, '\'');
  			smart_str_append(buf, ztmp2);
  			smart_str_appendc(buf, '\'');
  
  			zend_string_free(ztmp);
  			zend_string_free(ztmp2);
  			break;
  		case IS_ARRAY:
  			myht = Z_ARRVAL_P(struc);
  			if (!(GC_FLAGS(myht) & GC_IMMUTABLE)) {
  				if (GC_IS_RECURSIVE(myht)) {
  					smart_str_appendl(buf, "NULL", 4);
  					zend_error(E_WARNING, "var_export does not handle circular references");
  					return;
  				}
  				GC_ADDREF(myht);
  				GC_PROTECT_RECURSION(myht);
  			}
  			if (level > 1) {
  				smart_str_appendc(buf, '\n');
  				buffer_append_spaces(buf, level - 1);
  			}
  			smart_str_appendl(buf, "array (\n", 8);
  			ZEND_HASH_FOREACH_KEY_VAL(myht, index, key, val) {
  				php_array_element_export(val, index, key, level, buf);
  			} ZEND_HASH_FOREACH_END();
  			if (!(GC_FLAGS(myht) & GC_IMMUTABLE)) {
  				GC_UNPROTECT_RECURSION(myht);
  				GC_DELREF(myht);
  			}
  			if (level > 1) {
  				buffer_append_spaces(buf, level - 1);
  			}
  			smart_str_appendc(buf, ')');
  
  			break;
  
  		case IS_OBJECT:
  			myht = zend_get_properties_for(struc, ZEND_PROP_PURPOSE_VAR_EXPORT);
  			if (myht) {
  				if (GC_IS_RECURSIVE(myht)) {
  					smart_str_appendl(buf, "NULL", 4);
  					zend_error(E_WARNING, "var_export does not handle circular references");
  					zend_release_properties(myht);
  					return;
  				} else {
  					GC_TRY_PROTECT_RECURSION(myht);
  				}
  			}
  			if (level > 1) {
  				smart_str_appendc(buf, '\n');
  				buffer_append_spaces(buf, level - 1);
  			}
  
  			zend_class_entry *ce = Z_OBJCE_P(struc);
  			bool is_enum = ce->ce_flags & ZEND_ACC_ENUM;
  
  			/* stdClass has no __set_state method, but can be casted to */
  			if (ce == zend_standard_class_def) {
  				smart_str_appendl(buf, "(object) array(\n", 16);
  			} else {
  				smart_str_append(buf, ce->name);
  				if (is_enum) {
  					zend_object *zobj = Z_OBJ_P(struc);
  					zval *case_name_zval = zend_enum_fetch_case_name(zobj);
  					smart_str_appendl(buf, "::", 2);
  					smart_str_append(buf, Z_STR_P(case_name_zval));
  				} else {
  					smart_str_appendl(buf, "::__set_state(array(\n", 21);
  				}
  			}
  
  			if (myht) {
  				if (!is_enum) {
  					ZEND_HASH_FOREACH_KEY_VAL_IND(myht, index, key, val) {
  						php_object_element_export(val, index, key, level, buf);
  					} ZEND_HASH_FOREACH_END();
  				}
  				GC_TRY_UNPROTECT_RECURSION(myht);
  				zend_release_properties(myht);
  			}
  			if (level > 1 && !is_enum) {
  				buffer_append_spaces(buf, level - 1);
  			}
  			if (ce == zend_standard_class_def) {
  				smart_str_appendc(buf, ')');
  			} else if (!is_enum) {
  				smart_str_appendl(buf, "))", 2);
  			}
  
  			break;
  		case IS_REFERENCE:
  			struc = Z_REFVAL_P(struc);
  			goto again;
  			break;
  		default:
  			smart_str_appendl(buf, "NULL", 4);
  			break;
  	}
  }
  /* }}} */
  
  /* FOR BC reasons, this will always perform and then print */
  PHPAPI void php_var_export(zval *struc, int level) /* {{{ */
  {
  	smart_str buf = {0};
  	php_var_export_ex(struc, level, &buf);
  	smart_str_0(&buf);
  	PHPWRITE(ZSTR_VAL(buf.s), ZSTR_LEN(buf.s));
  	smart_str_free(&buf);
  }
  /* }}} */
  
  /* {{{ Outputs or returns a string representation of a variable */
  PHP_FUNCTION(var_export)
  {
  	zval *var;
  	bool return_output = 0;
  	smart_str buf = {0};
  
  	ZEND_PARSE_PARAMETERS_START(1, 2)
  		Z_PARAM_ZVAL(var)
  		Z_PARAM_OPTIONAL
  		Z_PARAM_BOOL(return_output)
  	ZEND_PARSE_PARAMETERS_END();
  
  	php_var_export_ex(var, 1, &buf);
  	smart_str_0 (&buf);
  
  	if (return_output) {
  		RETURN_NEW_STR(buf.s);
  	} else {
  		PHPWRITE(ZSTR_VAL(buf.s), ZSTR_LEN(buf.s));
  		smart_str_free(&buf);
  	}
  }
  /* }}} */
  
  static void php_var_serialize_intern(smart_str *buf, zval *struc, php_serialize_data_t var_hash);
  
  static inline zend_long php_add_var_hash(php_serialize_data_t data, zval *var) /* {{{ */
  {
  	zval *zv;
  	zend_ulong key;
  	bool is_ref = Z_ISREF_P(var);
  
  	data->n += 1;
  
  	if (!is_ref && (Z_TYPE_P(var) != IS_OBJECT || Z_REFCOUNT_P(var) == 1)) {
  		return 0;
  	}
  
  	/* References to objects are treated as if the reference didn't exist */
  	if (is_ref && Z_TYPE_P(Z_REFVAL_P(var)) == IS_OBJECT) {
  		var = Z_REFVAL_P(var);
  	}
  
  	/* Index for the variable is stored using the numeric value of the pointer to
  	 * the zend_refcounted struct */
  	key = (zend_ulong) (zend_uintptr_t) Z_COUNTED_P(var);
  	zv = zend_hash_index_find(&data->ht, key);
  
  	if (zv) {
  		/* References are only counted once, undo the data->n increment above */
  		if (is_ref && Z_LVAL_P(zv) != -1) {
  			data->n -= 1;
  		}
  
  		return Z_LVAL_P(zv);
  	} else {
  		zval zv_n;
  		ZVAL_LONG(&zv_n, data->n);
  		zend_hash_index_add_new(&data->ht, key, &zv_n);
  
  		/* Additionally to the index, we also store the variable, to ensure that it is
  		 * not destroyed during serialization and its pointer reused. The variable is
  		 * stored at the numeric value of the pointer + 1, which cannot be the location
  		 * of another zend_refcounted structure. */
  		zend_hash_index_add_new(&data->ht, key + 1, var);
  		Z_ADDREF_P(var);
  
  		return 0;
  	}
  }
  /* }}} */
  
  static inline void php_var_serialize_long(smart_str *buf, zend_long val) /* {{{ */
  {
  	char b[32];
  	char *s = zend_print_long_to_buf(b + sizeof(b) - 1, val);
  	size_t l = b + sizeof(b) - 1 - s;
  	char *res = smart_str_extend(buf, 2 + l + 1);
  	memcpy(res, "i:", 2);
  	res += 2;
  	memcpy(res, s, l);
  	res[l] = ';';
  }
  /* }}} */
  
  static inline void php_var_serialize_string(smart_str *buf, char *str, size_t len) /* {{{ */
  {
  	char b[32];
  	char *s = zend_print_long_to_buf(b + sizeof(b) - 1, len);
  	size_t l = b + sizeof(b) - 1 - s;
  	char *res = smart_str_extend(buf, 2 + l + 2 + len + 2);
  	memcpy(res, "s:", 2);
  	res += 2;
  	memcpy(res, s, l);
  	res += l;
  	memcpy(res, ":\"", 2);
  	res += 2;
  	memcpy(res, str, len);
  	res += len;
  	memcpy(res, "\";", 2);
  }
  /* }}} */
  
  static inline bool php_var_serialize_class_name(smart_str *buf, zval *struc) /* {{{ */
  {
  	char b[32];
  	PHP_CLASS_ATTRIBUTES;
  
  	PHP_SET_CLASS_ATTRIBUTES(struc);
  	size_t class_name_len = ZSTR_LEN(class_name);
  	char *s = zend_print_long_to_buf(b + sizeof(b) - 1, class_name_len);
  	size_t l = b + sizeof(b) - 1 - s;
  	char *res = smart_str_extend(buf, 2 + l + 2 + class_name_len + 2);
  	memcpy(res, "O:", 2);
  	res += 2;
  	memcpy(res, s, l);
  	res += l;
  	memcpy(res, ":\"", 2);
  	res += 2;
  	memcpy(res, ZSTR_VAL(class_name), class_name_len);
  	res += class_name_len;
  	memcpy(res, "\":", 2);
  	PHP_CLEANUP_CLASS_ATTRIBUTES();
  	return incomplete_class;
  }
  /* }}} */
  
  static HashTable* php_var_serialize_call_sleep(zend_object *obj, zend_function *fn) /* {{{ */
  {
  	zend_result res;
  	zend_fcall_info fci;
  	zend_fcall_info_cache fci_cache;
  	zval retval;
  
  	fci.size = sizeof(fci);
  	fci.object = obj;
  	fci.retval = &retval;
  	fci.param_count = 0;
  	fci.params = NULL;
  	fci.named_params = NULL;
  	ZVAL_UNDEF(&fci.function_name);
  
  	fci_cache.function_handler = fn;
  	fci_cache.object = obj;
  	fci_cache.called_scope = obj->ce;
  
  	BG(serialize_lock)++;
  	res = zend_call_function(&fci, &fci_cache);
  	BG(serialize_lock)--;
  
  	if (res == FAILURE || Z_ISUNDEF(retval)) {
  		zval_ptr_dtor(&retval);
  		return NULL;
  	}
  
  	if (Z_TYPE(retval) != IS_ARRAY) {
  		zval_ptr_dtor(&retval);
  		php_error_docref(NULL, E_WARNING, "%s::__sleep() should return an array only containing the names of instance-variables to serialize", ZSTR_VAL(obj->ce->name));
  		return NULL;
  	}
  
  	return Z_ARRVAL(retval);
  }
  /* }}} */
  
  static int php_var_serialize_call_magic_serialize(zval *retval, zval *obj) /* {{{ */
  {
  	BG(serialize_lock)++;
  	zend_call_known_instance_method_with_0_params(
  		Z_OBJCE_P(obj)->__serialize, Z_OBJ_P(obj), retval);
  	BG(serialize_lock)--;
  
  	if (EG(exception)) {
  		zval_ptr_dtor(retval);
  		return FAILURE;
  	}
  
  	if (Z_TYPE_P(retval) != IS_ARRAY) {
  		zval_ptr_dtor(retval);
  		zend_type_error("%s::__serialize() must return an array", ZSTR_VAL(Z_OBJCE_P(obj)->name));
  		return FAILURE;
  	}
  
  	return SUCCESS;
  }
  /* }}} */
  
  static int php_var_serialize_try_add_sleep_prop(
  		HashTable *ht, HashTable *props, zend_string *name, zend_string *error_name, zval *struc) /* {{{ */
  {
  	zval *val = zend_hash_find(props, name);
  	if (val == NULL) {
  		return FAILURE;
  	}
  
  	if (Z_TYPE_P(val) == IS_INDIRECT) {
  		val = Z_INDIRECT_P(val);
  		if (Z_TYPE_P(val) == IS_UNDEF) {
  			zend_property_info *info = zend_get_typed_property_info_for_slot(Z_OBJ_P(struc), val);
  			if (info) {
  				return SUCCESS;
  			}
  			return FAILURE;
  		}
  	}
  
  	if (!zend_hash_add(ht, name, val)) {
  		php_error_docref(NULL, E_NOTICE,
  			"\"%s\" is returned from __sleep() multiple times", ZSTR_VAL(error_name));
  		return SUCCESS;
  	}
  
  	Z_TRY_ADDREF_P(val);
  	return SUCCESS;
  }
  /* }}} */
  
  static int php_var_serialize_get_sleep_props(
  		HashTable *ht, zval *struc, HashTable *sleep_retval) /* {{{ */
  {
  	zend_class_entry *ce = Z_OBJCE_P(struc);
  	HashTable *props = zend_get_properties_for(struc, ZEND_PROP_PURPOSE_SERIALIZE);
  	zval *name_val;
  	int retval = SUCCESS;
  
  	zend_hash_init(ht, zend_hash_num_elements(sleep_retval), NULL, ZVAL_PTR_DTOR, 0);
  	/* TODO: Rewrite this by fetching the property info instead of trying out different
  	 * name manglings? */
  	ZEND_HASH_FOREACH_VAL_IND(sleep_retval, name_val) {
  		zend_string *name, *tmp_name, *priv_name, *prot_name;
  
  		ZVAL_DEREF(name_val);
  		if (Z_TYPE_P(name_val) != IS_STRING) {
  			php_error_docref(NULL, E_WARNING,
  					"%s::__sleep() should return an array only containing the names of instance-variables to serialize",
  					ZSTR_VAL(ce->name));
  		}
  
  		name = zval_get_tmp_string(name_val, &tmp_name);
  		if (php_var_serialize_try_add_sleep_prop(ht, props, name, name, struc) == SUCCESS) {
  			zend_tmp_string_release(tmp_name);
  			continue;
  		}
  
  		if (EG(exception)) {
  			zend_tmp_string_release(tmp_name);
  			retval = FAILURE;
  			break;
  		}
  
  		priv_name = zend_mangle_property_name(
  			ZSTR_VAL(ce->name), ZSTR_LEN(ce->name),
  			ZSTR_VAL(name), ZSTR_LEN(name), ce->type & ZEND_INTERNAL_CLASS);
  		if (php_var_serialize_try_add_sleep_prop(ht, props, priv_name, name, struc) == SUCCESS) {
  			zend_tmp_string_release(tmp_name);
  			zend_string_release(priv_name);
  			continue;
  		}
  		zend_string_release(priv_name);
  
  		if (EG(exception)) {
  			zend_tmp_string_release(tmp_name);
  			retval = FAILURE;
  			break;
  		}
  
  		prot_name = zend_mangle_property_name(
  			"*", 1, ZSTR_VAL(name), ZSTR_LEN(name), ce->type & ZEND_INTERNAL_CLASS);
  		if (php_var_serialize_try_add_sleep_prop(ht, props, prot_name, name, struc) == SUCCESS) {
  			zend_tmp_string_release(tmp_name);
  			zend_string_release(prot_name);
  			continue;
  		}
  		zend_string_release(prot_name);
  
  		if (EG(exception)) {
  			zend_tmp_string_release(tmp_name);
  			retval = FAILURE;
  			break;
  		}
  
  		php_error_docref(NULL, E_WARNING,
  			"\"%s\" returned as member variable from __sleep() but does not exist", ZSTR_VAL(name));
  		zend_tmp_string_release(tmp_name);
  	} ZEND_HASH_FOREACH_END();
  
  	zend_release_properties(props);
  	return retval;
  }
  /* }}} */
  
  static void php_var_serialize_nested_data(smart_str *buf, zval *struc, HashTable *ht, uint32_t count, bool incomplete_class, php_serialize_data_t var_hash) /* {{{ */
  {
  	smart_str_append_unsigned(buf, count);
  	smart_str_appendl(buf, ":{", 2);
  	if (count > 0) {
  		zend_string *key;
  		zval *data;
  		zend_ulong index;
  
  		ZEND_HASH_FOREACH_KEY_VAL_IND(ht, index, key, data) {
  			if (incomplete_class && zend_string_equals_literal(key, MAGIC_MEMBER)) {
  				incomplete_class = 0;
  				continue;
  			}
  
  			if (!key) {
  				php_var_serialize_long(buf, index);
  			} else {
  				php_var_serialize_string(buf, ZSTR_VAL(key), ZSTR_LEN(key));
  			}
  
  			if (Z_ISREF_P(data) && Z_REFCOUNT_P(data) == 1) {
  				data = Z_REFVAL_P(data);
  			}
  
  			/* we should still add element even if it's not OK,
  			 * since we already wrote the length of the array before */
  			if (Z_TYPE_P(data) == IS_ARRAY) {
  				if (UNEXPECTED(Z_IS_RECURSIVE_P(data))
  					|| UNEXPECTED(Z_TYPE_P(struc) == IS_ARRAY && Z_ARR_P(data) == Z_ARR_P(struc))) {
  					php_add_var_hash(var_hash, struc);
  					smart_str_appendl(buf, "N;", 2);
  				} else {
  					if (Z_REFCOUNTED_P(data)) {
  						Z_PROTECT_RECURSION_P(data);
  					}
  					php_var_serialize_intern(buf, data, var_hash);
  					if (Z_REFCOUNTED_P(data)) {
  						Z_UNPROTECT_RECURSION_P(data);
  					}
  				}
  			} else {
  				php_var_serialize_intern(buf, data, var_hash);
  			}
  		} ZEND_HASH_FOREACH_END();
  	}
  	smart_str_appendc(buf, '}');
  }
  /* }}} */
  
  static void php_var_serialize_class(smart_str *buf, zval *struc, HashTable *ht, php_serialize_data_t var_hash) /* {{{ */
  {
  	HashTable props;
  
  	if (php_var_serialize_get_sleep_props(&props, struc, ht) == SUCCESS) {
  		php_var_serialize_class_name(buf, struc);
  		php_var_serialize_nested_data(
  			buf, struc, &props, zend_hash_num_elements(&props), /* incomplete_class */ 0, var_hash);
  	}
  	zend_hash_destroy(&props);
  }
  /* }}} */
  
  static void php_var_serialize_intern(smart_str *buf, zval *struc, php_serialize_data_t var_hash) /* {{{ */
  {
  	zend_long var_already;
  	HashTable *myht;
  
  	if (EG(exception)) {
  		return;
  	}
  
  	if (var_hash && (var_already = php_add_var_hash(var_hash, struc))) {
  		if (var_already == -1) {
  			/* Reference to an object that failed to serialize, replace with null. */
  			smart_str_appendl(buf, "N;", 2);
  			return;
  		} else if (Z_ISREF_P(struc)) {
  			smart_str_appendl(buf, "R:", 2);
  			smart_str_append_long(buf, var_already);
  			smart_str_appendc(buf, ';');
  			return;
  		} else if (Z_TYPE_P(struc) == IS_OBJECT) {
  			smart_str_appendl(buf, "r:", 2);
  			smart_str_append_long(buf, var_already);
  			smart_str_appendc(buf, ';');
  			return;
  		}
  	}
  
  again:
  	switch (Z_TYPE_P(struc)) {
  		case IS_FALSE:
  			smart_str_appendl(buf, "b:0;", 4);
  			return;
  
  		case IS_TRUE:
  			smart_str_appendl(buf, "b:1;", 4);
  			return;
  
  		case IS_NULL:
  			smart_str_appendl(buf, "N;", 2);
  			return;
  
  		case IS_LONG:
  			php_var_serialize_long(buf, Z_LVAL_P(struc));
  			return;
  
  		case IS_DOUBLE: {
  			char tmp_str[PHP_DOUBLE_MAX_LENGTH];
  			php_gcvt(Z_DVAL_P(struc), (int)PG(serialize_precision), '.', 'E', tmp_str);
  
  			size_t len = strlen(tmp_str);
  			char *res = smart_str_extend(buf, 2 + len + 1);
  			memcpy(res, "d:", 2);
  			res += 2;
  			memcpy(res, tmp_str, len);
  			res[len] = ';';
  			return;
  		}
  
  		case IS_STRING:
  			php_var_serialize_string(buf, Z_STRVAL_P(struc), Z_STRLEN_P(struc));
  			return;
  
  		case IS_OBJECT: {
  				zend_class_entry *ce = Z_OBJCE_P(struc);
  				bool incomplete_class;
  				uint32_t count;
  
  				if (ce->ce_flags & ZEND_ACC_NOT_SERIALIZABLE) {
  					zend_throw_exception_ex(NULL, 0, "Serialization of '%s' is not allowed",
  						ZSTR_VAL(ce->name));
  					return;
  				}
  
  				if (ce->ce_flags & ZEND_ACC_ENUM) {
  					PHP_CLASS_ATTRIBUTES;
  
  					zval *case_name_zval = zend_enum_fetch_case_name(Z_OBJ_P(struc));
  
  					PHP_SET_CLASS_ATTRIBUTES(struc);
  					smart_str_appendl(buf, "E:", 2);
  					smart_str_append_unsigned(buf, ZSTR_LEN(class_name) + strlen(":") + Z_STRLEN_P(case_name_zval));
  					smart_str_appendl(buf, ":\"", 2);
  					smart_str_append(buf, class_name);
  					smart_str_appendc(buf, ':');
  					smart_str_append(buf, Z_STR_P(case_name_zval));
  					smart_str_appendl(buf, "\";", 2);
  					PHP_CLEANUP_CLASS_ATTRIBUTES();
  					return;
  				}
  
  				if (ce->__serialize) {
  					zval retval, obj;
  					zend_string *key;
  					zval *data;
  					zend_ulong index;
  
  					ZVAL_OBJ_COPY(&obj, Z_OBJ_P(struc));
  					if (php_var_serialize_call_magic_serialize(&retval, &obj) == FAILURE) {
  						if (!EG(exception)) {
  							smart_str_appendl(buf, "N;", 2);
  						}
  						zval_ptr_dtor(&obj);
  						return;
  					}
  
  					php_var_serialize_class_name(buf, &obj);
  					smart_str_append_unsigned(buf, zend_hash_num_elements(Z_ARRVAL(retval)));
  					smart_str_appendl(buf, ":{", 2);
  					ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL(retval), index, key, data) {
  						if (!key) {
  							php_var_serialize_long(buf, index);
  						} else {
  							php_var_serialize_string(buf, ZSTR_VAL(key), ZSTR_LEN(key));
  						}
  
  						if (Z_ISREF_P(data) && Z_REFCOUNT_P(data) == 1) {
  							data = Z_REFVAL_P(data);
  						}
  						php_var_serialize_intern(buf, data, var_hash);
  					} ZEND_HASH_FOREACH_END();
  					smart_str_appendc(buf, '}');
  
  					zval_ptr_dtor(&obj);
  					zval_ptr_dtor(&retval);
  					return;
  				}
  
  				if (ce->serialize != NULL) {
  					/* has custom handler */
  					unsigned char *serialized_data = NULL;
  					size_t serialized_length;
  
  					if (ce->serialize(struc, &serialized_data, &serialized_length, (zend_serialize_data *)var_hash) == SUCCESS) {
  						char b1[32], b2[32];
  						char *s1 = zend_print_long_to_buf(b1 + sizeof(b1) - 1, ZSTR_LEN(Z_OBJCE_P(struc)->name));
  						size_t l1 = b1 + sizeof(b1) - 1 - s1;
  						char *s2 = zend_print_long_to_buf(b2 + sizeof(b2) - 1, serialized_length);
  						size_t l2 = b2 + sizeof(b2) - 1 - s2;
  						char *res = smart_str_extend(buf, 2 + l1 + 2 + ZSTR_LEN(Z_OBJCE_P(struc)->name) + 2 + l2 + 2 + serialized_length + 1);
  						memcpy(res, "C:", 2);
  						res += 2;
  						memcpy(res, s1, l1);
  						res += l1;
  						memcpy(res, ":\"", 2);
  						res += 2;
  						memcpy(res, ZSTR_VAL(Z_OBJCE_P(struc)->name), ZSTR_LEN(Z_OBJCE_P(struc)->name));
  						res += ZSTR_LEN(Z_OBJCE_P(struc)->name);
  						memcpy(res, "\":", 2);
  						res += 2;
  
  						memcpy(res, s2, l2);
  						res += l2;
  						memcpy(res, ":{", 2);
  						res += 2;
  						memcpy(res, (char *) serialized_data, serialized_length);
  						res[serialized_length] = '}';
  					} else {
  						/* Mark this value in the var_hash, to avoid creating references to it. */
  						zval *var_idx = zend_hash_index_find(&var_hash->ht,
  							(zend_ulong) (zend_uintptr_t) Z_COUNTED_P(struc));
  						if (var_idx) {
  							ZVAL_LONG(var_idx, -1);
  						}
  						smart_str_appendl(buf, "N;", 2);
  					}
  					if (serialized_data) {
  						efree(serialized_data);
  					}
  					return;
  				}
  
  				if (ce != PHP_IC_ENTRY) {
  					zval *zv = zend_hash_find_known_hash(&ce->function_table, ZSTR_KNOWN(ZEND_STR_SLEEP));
  
  					if (zv) {
  						HashTable *ht;
  						zval tmp;
  
  						ZVAL_OBJ_COPY(&tmp, Z_OBJ_P(struc));
  						if (!(ht = php_var_serialize_call_sleep(Z_OBJ(tmp), Z_FUNC_P(zv)))) {
  							if (!EG(exception)) {
  								/* we should still add element even if it's not OK,
  								 * since we already wrote the length of the array before */
  								smart_str_appendl(buf, "N;", 2);
  							}
  							OBJ_RELEASE(Z_OBJ(tmp));
  							return;
  						}
  
  						php_var_serialize_class(buf, &tmp, ht, var_hash);
  						zend_array_release(ht);
  						OBJ_RELEASE(Z_OBJ(tmp));
  						return;
  					}
  				}
  
  				incomplete_class = php_var_serialize_class_name(buf, struc);
  
  				if (Z_OBJ_P(struc)->properties == NULL
  				 && Z_OBJ_HT_P(struc)->get_properties_for == NULL
  				 && Z_OBJ_HT_P(struc)->get_properties == zend_std_get_properties) {
  					/* Optimized version without rebulding properties HashTable */
  					zend_object *obj = Z_OBJ_P(struc);
  					zend_class_entry *ce = obj->ce;
  					zend_property_info *prop_info;
  					zval *prop;
  					int i;
  
  					count = ce->default_properties_count;
  					for (i = 0; i < ce->default_properties_count; i++) {
  						prop_info = ce->properties_info_table[i];
  						if (!prop_info) {
  							count--;
  							continue;
  						}
  						prop = OBJ_PROP(obj, prop_info->offset);
  						if (Z_TYPE_P(prop) == IS_UNDEF) {
  							count--;
  							continue;
  						}
  					}
  					if (count) {
  						smart_str_append_unsigned(buf, count);
  						smart_str_appendl(buf, ":{", 2);
  						for (i = 0; i < ce->default_properties_count; i++) {
  							prop_info = ce->properties_info_table[i];
  							if (!prop_info) {
  								continue;
  							}
  							prop = OBJ_PROP(obj, prop_info->offset);
  							if (Z_TYPE_P(prop) == IS_UNDEF) {
  								continue;
  							}
  
  							php_var_serialize_string(buf, ZSTR_VAL(prop_info->name), ZSTR_LEN(prop_info->name));
  
  							if (Z_ISREF_P(prop) && Z_REFCOUNT_P(prop) == 1) {
  								prop = Z_REFVAL_P(prop);
  							}
  
  							php_var_serialize_intern(buf, prop, var_hash);
  						}
  						smart_str_appendc(buf, '}');
  					} else {
  						smart_str_appendl(buf, "0:{}", 4);
  					}
  					return;
  				}
  				myht = zend_get_properties_for(struc, ZEND_PROP_PURPOSE_SERIALIZE);
  				/* count after serializing name, since php_var_serialize_class_name
  				 * changes the count if the variable is incomplete class */
  				count = zend_array_count(myht);
  				if (count > 0 && incomplete_class) {
  					--count;
  				}
  				php_var_serialize_nested_data(buf, struc, myht, count, incomplete_class, var_hash);
  				zend_release_properties(myht);
  				return;
  			}
  		case IS_ARRAY:
  			smart_str_appendl(buf, "a:", 2);
  			myht = Z_ARRVAL_P(struc);
  			php_var_serialize_nested_data(
  				buf, struc, myht, zend_array_count(myht), /* incomplete_class */ 0, var_hash);
  			return;
  		case IS_REFERENCE:
  			struc = Z_REFVAL_P(struc);
  			goto again;
  		default:
  			smart_str_appendl(buf, "i:0;", 4);
  			return;
  	}
  }
  /* }}} */
  
  PHPAPI void php_var_serialize(smart_str *buf, zval *struc, php_serialize_data_t *data) /* {{{ */
  {
  	php_var_serialize_intern(buf, struc, *data);
  	smart_str_0(buf);
  }
  /* }}} */
  
  PHPAPI php_serialize_data_t php_var_serialize_init(void) {
  	struct php_serialize_data *d;
  	/* fprintf(stderr, "SERIALIZE_INIT      == lock: %u, level: %u\n", BG(serialize_lock), BG(serialize).level); */
  	if (BG(serialize_lock) || !BG(serialize).level) {
  		d = emalloc(sizeof(struct php_serialize_data));
  		zend_hash_init(&d->ht, 16, NULL, ZVAL_PTR_DTOR, 0);
  		d->n = 0;
  		if (!BG(serialize_lock)) {
  			BG(serialize).data = d;
  			BG(serialize).level = 1;
  		}
  	} else {
  		d = BG(serialize).data;
  		++BG(serialize).level;
  	}
  	return d;
  }
  
  PHPAPI void php_var_serialize_destroy(php_serialize_data_t d) {
  	/* fprintf(stderr, "SERIALIZE_DESTROY   == lock: %u, level: %u\n", BG(serialize_lock), BG(serialize).level); */
  	if (BG(serialize_lock) || BG(serialize).level == 1) {
  		zend_hash_destroy(&d->ht);
  		efree(d);
  	}
  	if (!BG(serialize_lock) && !--BG(serialize).level) {
  		BG(serialize).data = NULL;
  	}
  }
  
  /* {{{ Returns a string representation of variable (which can later be unserialized) */
  PHP_FUNCTION(serialize)
  {
  	zval *struc;
  	php_serialize_data_t var_hash;
  	smart_str buf = {0};
  
  	ZEND_PARSE_PARAMETERS_START(1, 1)
  		Z_PARAM_ZVAL(struc)
  	ZEND_PARSE_PARAMETERS_END();
  
  	PHP_VAR_SERIALIZE_INIT(var_hash);
  	php_var_serialize(&buf, struc, &var_hash);
  	PHP_VAR_SERIALIZE_DESTROY(var_hash);
  
  	if (EG(exception)) {
  		smart_str_free(&buf);
  		RETURN_THROWS();
  	}
  
  	if (buf.s) {
  		RETURN_NEW_STR(buf.s);
  	} else {
  		RETURN_EMPTY_STRING();
  	}
  }
  /* }}} */
  
  /* {{{ Takes a string representation of variable and recreates it, subject to the optional unserialize options HashTable */
  PHPAPI void php_unserialize_with_options(zval *return_value, const char *buf, const size_t buf_len, HashTable *options, const char* function_name)
  {
  	const unsigned char *p;
  	php_unserialize_data_t var_hash;
  	zval *retval;
  	HashTable *class_hash = NULL, *prev_class_hash;
  	zend_long prev_max_depth, prev_cur_depth;
  
  	if (buf_len == 0) {
  		RETURN_FALSE;
  	}
  
  	p = (const unsigned char*) buf;
  	PHP_VAR_UNSERIALIZE_INIT(var_hash);
  
  	prev_class_hash = php_var_unserialize_get_allowed_classes(var_hash);
  	prev_max_depth = php_var_unserialize_get_max_depth(var_hash);
  	prev_cur_depth = php_var_unserialize_get_cur_depth(var_hash);
  	if (options != NULL) {
  		zval *classes, *max_depth;
  
  		classes = zend_hash_str_find_deref(options, "allowed_classes", sizeof("allowed_classes")-1);
  		if (classes && Z_TYPE_P(classes) != IS_ARRAY && Z_TYPE_P(classes) != IS_TRUE && Z_TYPE_P(classes) != IS_FALSE) {
  			zend_type_error("%s(): Option \"allowed_classes\" must be of type array|bool, %s given", function_name, zend_zval_type_name(classes));
  			goto cleanup;
  		}
  
  		if(classes && (Z_TYPE_P(classes) == IS_ARRAY || !zend_is_true(classes))) {
  			ALLOC_HASHTABLE(class_hash);
  			zend_hash_init(class_hash, (Z_TYPE_P(classes) == IS_ARRAY)?zend_hash_num_elements(Z_ARRVAL_P(classes)):0, NULL, NULL, 0);
  		}
  		if(class_hash && Z_TYPE_P(classes) == IS_ARRAY) {
  			zval *entry;
  			zend_string *lcname;
  
  			ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(classes), entry) {
  				convert_to_string(entry);
  				lcname = zend_string_tolower(Z_STR_P(entry));
  				zend_hash_add_empty_element(class_hash, lcname);
  		        zend_string_release_ex(lcname, 0);
  			} ZEND_HASH_FOREACH_END();
  
  			/* Exception during string conversion. */
  			if (EG(exception)) {
  				goto cleanup;
  			}
  		}
  		php_var_unserialize_set_allowed_classes(var_hash, class_hash);
  
  		max_depth = zend_hash_str_find_deref(options, "max_depth", sizeof("max_depth") - 1);
  		if (max_depth) {
  			if (Z_TYPE_P(max_depth) != IS_LONG) {
  				zend_type_error("%s(): Option \"max_depth\" must be of type int, %s given", function_name, zend_zval_type_name(max_depth));
  				goto cleanup;
  			}
  			if (Z_LVAL_P(max_depth) < 0) {
  				zend_value_error("%s(): Option \"max_depth\" must be greater than or equal to 0", function_name);
  				goto cleanup;
  			}
  
  			php_var_unserialize_set_max_depth(var_hash, Z_LVAL_P(max_depth));
  			/* If the max_depth for a nested unserialize() call has been overridden,
  			 * start counting from zero again (for the nested call only). */
  			php_var_unserialize_set_cur_depth(var_hash, 0);
  		}
  	}
  
  	if (BG(unserialize).level > 1) {
  		retval = var_tmp_var(&var_hash);
  	} else {
  		retval = return_value;
  	}
  	if (!php_var_unserialize(retval, &p, p + buf_len, &var_hash)) {
  		if (!EG(exception)) {
  			php_error_docref(NULL, E_NOTICE, "Error at offset " ZEND_LONG_FMT " of %zd bytes",
  				(zend_long)((char*)p - buf), buf_len);
  		}
  		if (BG(unserialize).level <= 1) {
  			zval_ptr_dtor(return_value);
  		}
  		RETVAL_FALSE;
  	} else if (BG(unserialize).level > 1) {
  		ZVAL_COPY(return_value, retval);
  	} else if (Z_REFCOUNTED_P(return_value)) {
  		zend_refcounted *ref = Z_COUNTED_P(return_value);
  		gc_check_possible_root(ref);
  	}
  
  cleanup:
  	if (class_hash) {
  		zend_hash_destroy(class_hash);
  		FREE_HASHTABLE(class_hash);
  	}
  
  	/* Reset to previous options in case this is a nested call */
  	php_var_unserialize_set_allowed_classes(var_hash, prev_class_hash);
  	php_var_unserialize_set_max_depth(var_hash, prev_max_depth);
  	php_var_unserialize_set_cur_depth(var_hash, prev_cur_depth);
  	PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
  
  	/* Per calling convention we must not return a reference here, so unwrap. We're doing this at
  	 * the very end, because __wakeup() calls performed during UNSERIALIZE_DESTROY might affect
  	 * the value we unwrap here. This is compatible with behavior in PHP <=7.0. */
  	if (Z_ISREF_P(return_value)) {
  		zend_unwrap_reference(return_value);
  	}
  }
  /* }}} */
  
  /* {{{ Takes a string representation of variable and recreates it */
  PHP_FUNCTION(unserialize)
  {
  	char *buf = NULL;
  	size_t buf_len;
  	HashTable *options = NULL;
  
  	ZEND_PARSE_PARAMETERS_START(1, 2)
  		Z_PARAM_STRING(buf, buf_len)
  		Z_PARAM_OPTIONAL
  		Z_PARAM_ARRAY_HT(options)
  	ZEND_PARSE_PARAMETERS_END();
  
  	php_unserialize_with_options(return_value, buf, buf_len, options, "unserialize");
  }
  /* }}} */
  
  /* {{{ Returns the allocated by PHP memory */
  PHP_FUNCTION(memory_get_usage) {
  	bool real_usage = 0;
  
  	ZEND_PARSE_PARAMETERS_START(0, 1)
  		Z_PARAM_OPTIONAL
  		Z_PARAM_BOOL(real_usage)
  	ZEND_PARSE_PARAMETERS_END();
  
  	RETURN_LONG(zend_memory_usage(real_usage));
  }
  /* }}} */
  
  /* {{{ Returns the peak allocated by PHP memory */
  PHP_FUNCTION(memory_get_peak_usage) {
  	bool real_usage = 0;
  
  	ZEND_PARSE_PARAMETERS_START(0, 1)
  		Z_PARAM_OPTIONAL
  		Z_PARAM_BOOL(real_usage)
  	ZEND_PARSE_PARAMETERS_END();
  
  	RETURN_LONG(zend_memory_peak_usage(real_usage));
  }
  /* }}} */
  
  PHP_INI_BEGIN()
  	STD_PHP_INI_ENTRY("unserialize_max_depth", "4096", PHP_INI_ALL, OnUpdateLong, unserialize_max_depth, php_basic_globals, basic_globals)
  PHP_INI_END()
  
  PHP_MINIT_FUNCTION(var)
  {
  	REGISTER_INI_ENTRIES();
  	return SUCCESS;
  }
  