original_string: protected function get_indexing_restrictions() {
          global $DB;
  
          // This includes completely empty configdata, and also three other values that are
          // equivalent to empty:
          // - A serialized completely empty object.
          // - A serialized object with one field called '0' (string not int) set to boolean false
          //   (this can happen after backup and restore, at least historically).
          // - A serialized null.
          $stupidobject = (object)[];
          $zero = '0';
          $stupidobject->{$zero} = false;
          return [$DB->sql_compare_text('bi.configdata') . " != ? AND " .
                  $DB->sql_compare_text('bi.configdata') . " != ? AND " .
                  $DB->sql_compare_text('bi.configdata') . " != ? AND " .
                  $DB->sql_compare_text('bi.configdata') . " != ?",
                  ['', base64_encode(serialize((object)[])), base64_encode(serialize($stupidobject)),
                  base64_encode(serialize(null))]];
      }
code: protected function get_indexing_restrictions() {
          global $DB;
  
          // This includes completely empty configdata, and also three other values that are
          // equivalent to empty:
          // - A serialized completely empty object.
          // - A serialized object with one field called '0' (string not int) set to boolean false
          //   (this can happen after backup and restore, at least historically).
          // - A serialized null.
          $stupidobject = (object)[];
          $zero = '0';
          $stupidobject->{$zero} = false;
          return [$DB->sql_compare_text('bi.configdata') . " != ? AND " .
                  $DB->sql_compare_text('bi.configdata') . " != ? AND " .
                  $DB->sql_compare_text('bi.configdata') . " != ? AND " .
                  $DB->sql_compare_text('bi.configdata') . " != ?",
                  ['', base64_encode(serialize((object)[])), base64_encode(serialize($stupidobject)),
                  base64_encode(serialize(null))]];
      }
code_tokens: protected function get_indexing_restrictions ( ) { global $ DB ; // This includes completely empty configdata, and also three other values that are // equivalent to empty: // - A serialized completely empty object. // - A serialized object with one field called '0' (string not int) set to boolean false //   (this can happen after backup and restore, at least historically). // - A serialized null. $ stupidobject = ( object ) [ ] ; $ zero = '0' ; $ stupidobject -> { $ zero } = false ; return [ $ DB -> sql_compare_text ( 'bi.configdata' ) . " != ? AND " . $ DB -> sql_compare_text ( 'bi.configdata' ) . " != ? AND " . $ DB -> sql_compare_text ( 'bi.configdata' ) . " != ? AND " . $ DB -> sql_compare_text ( 'bi.configdata' ) . " != ?" , [ '' , base64_encode ( serialize ( ( object ) [ ] ) ) , base64_encode ( serialize ( $ stupidobject ) ) , base64_encode ( serialize ( null ) ) ] ] ; }
docstring: Returns restrictions on which block_instances rows to return. By default, excludes rows
  that have empty configdata.
  
  If no restriction is required, you could return ['', []].
  
  @return array 2-element array of SQL restriction and params for it
docstring_tokens: Returns restrictions on which block_instances rows to return . By default excludes rows that have empty configdata .