original_string: protected function quoteIdentifier($identifier)
      {
          if (!is_array($identifier)) {
              return $this->connection->quoteIdentifier($identifier);
          }
  
          foreach ($identifier as &$value) {
              $value = $this->connection->quoteIdentifier($value);
              unset($value);
          }
  
          return $identifier;
      }
code: protected function quoteIdentifier($identifier)
      {
          if (!is_array($identifier)) {
              return $this->connection->quoteIdentifier($identifier);
          }
  
          foreach ($identifier as &$value) {
              $value = $this->connection->quoteIdentifier($value);
              unset($value);
          }
  
          return $identifier;
      }
code_tokens: protected function quoteIdentifier ( $ identifier ) { if ( ! is_array ( $ identifier ) ) { return $ this -> connection -> quoteIdentifier ( $ identifier ) ; } foreach ( $ identifier as & $ value ) { $ value = $ this -> connection -> quoteIdentifier ( $ value ) ; unset ( $ value ) ; } return $ identifier ; }
docstring: Quotes SQL identifier or array of identifiers
  
  @param string|array $identifier
  
  @return string|array
docstring_tokens: Quotes SQL identifier or array of identifiers