original_string: static public function validate( ezcDbSchema $schema )
      {
          $errors = array();
  
          /* For each table we first retrieve all the field names, and then check
           * per index whether the fields it references exist */
          foreach ( $schema->getSchema() as $tableName => $table )
          {
              $fields = array_keys( $table->fields );
  
              foreach ( $table->indexes as $indexName => $index )
              {
                  foreach ( $index->indexFields as $indexFieldName => $dummy )
                  {
                      if ( !in_array( $indexFieldName, $fields ) )
                      {
                          $errors[] = "Index '$tableName:$indexName' references unknown field name '$tableName:$indexFieldName'.";
                      }
                  }
              }
          }
  
          return $errors;
      }
code: static public function validate( ezcDbSchema $schema )
      {
          $errors = array();
  
          /* For each table we first retrieve all the field names, and then check
           * per index whether the fields it references exist */
          foreach ( $schema->getSchema() as $tableName => $table )
          {
              $fields = array_keys( $table->fields );
  
              foreach ( $table->indexes as $indexName => $index )
              {
                  foreach ( $index->indexFields as $indexFieldName => $dummy )
                  {
                      if ( !in_array( $indexFieldName, $fields ) )
                      {
                          $errors[] = "Index '$tableName:$indexName' references unknown field name '$tableName:$indexFieldName'.";
                      }
                  }
              }
          }
  
          return $errors;
      }
code_tokens: static public function validate ( ezcDbSchema $ schema ) { $ errors = array ( ) ; /* For each table we first retrieve all the field names, and then check
           * per index whether the fields it references exist */ foreach ( $ schema -> getSchema ( ) as $ tableName => $ table ) { $ fields = array_keys ( $ table -> fields ) ; foreach ( $ table -> indexes as $ indexName => $ index ) { foreach ( $ index -> indexFields as $ indexFieldName => $ dummy ) { if ( ! in_array ( $ indexFieldName , $ fields ) ) { $ errors [ ] = "Index '$tableName:$indexName' references unknown field name '$tableName:$indexFieldName'." ; } } } } return $ errors ; }
docstring: Validates if all the fields used in all indexes exist.
  
  This method loops over all the fields in the indexes of each table and
  checks whether the fields that is used in an index is also defined in
  the table definition. It will return an array containing error strings
  for each non-supported type that it finds.
  
  @param ezcDbSchema $schema
  @return array(string)
docstring_tokens: Validates if all the fields used in all indexes exist .