original_string: private function splitConfigurationKey($configurationIdentifier)
      {
          $configurationIdentifier = explode('.', $configurationIdentifier, 2);
  
          if (count($configurationIdentifier) === 1) {
              array_unshift($configurationIdentifier, '');
          }
  
          return $configurationIdentifier;
      }
code: private function splitConfigurationKey($configurationIdentifier)
      {
          $configurationIdentifier = explode('.', $configurationIdentifier, 2);
  
          if (count($configurationIdentifier) === 1) {
              array_unshift($configurationIdentifier, '');
          }
  
          return $configurationIdentifier;
      }
code_tokens: private function splitConfigurationKey ( $ configurationIdentifier ) { $ configurationIdentifier = explode ( '.' , $ configurationIdentifier , 2 ) ; if ( count ( $ configurationIdentifier ) === 1 ) { array_unshift ( $ configurationIdentifier , '' ) ; } return $ configurationIdentifier ; }
docstring: Split the configuration identifier and return each part.
  
  @param string $configurationIdentifier Configuration identifier
  
  @return string[] Identifier splitted
docstring_tokens: Split the configuration identifier and return each part .