SPL_METHOD(SplFileObject, fputcsv)
{
	spl_filesystem_object *intern = (spl_filesystem_object*)zend_object_store_get_object(getThis() TSRMLS_CC);
	char delimiter = intern->u.file.delimiter, enclosure = intern->u.file.enclosure, escape = intern->u.file.escape;
	char *delim = NULL, *enclo = NULL, *esc = NULL;
	int d_len = 0, e_len = 0, esc_len = 0, ret;
	zval *fields = NULL;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "a|sss", &fields, &delim, &d_len, &enclo, &e_len, &esc, &esc_len) == SUCCESS) {
		switch(ZEND_NUM_ARGS())
		{
		case 4:
			if (esc_len != 1) {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "escape must be a character");
				RETURN_FALSE;
			}
			escape = esc[0];
			/* no break */
		case 3:
			if (e_len != 1) {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "enclosure must be a character");
				RETURN_FALSE;
			}
			enclosure = enclo[0];
			/* no break */
		case 2:
			if (d_len != 1) {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "delimiter must be a character");
				RETURN_FALSE;
			}
			delimiter = delim[0];
			/* no break */
		case 1:
		case 0:
			break;
		}
		ret = php_fputcsv(intern->u.file.stream, fields, delimiter, enclosure, escape TSRMLS_CC);
		RETURN_LONG(ret);
	}
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.