original_string: public function marshal($value)
      {
          if ($value === null || $value === '' || is_array($value)) {
              return null;
          }
  
          return (string)$value;
      }
code: public function marshal($value)
      {
          if ($value === null || $value === '' || is_array($value)) {
              return null;
          }
  
          return (string)$value;
      }
code_tokens: public function marshal ( $ value ) { if ( $ value === null || $ value === '' || is_array ( $ value ) ) { return null ; } return ( string ) $ value ; }
docstring: Marshals request data into a PHP string
  
  @param mixed $value The value to convert.
  @return string|null Converted value.
docstring_tokens: Marshals request data into a PHP string