original_string: public function setPostMessageTemplate($postMessage = null)
      {
          if (null !== $postMessage) {
              $postMessage = (string) $postMessage;
          }
          $this->abstractOptions['messageTemplates']
                                [self::POST_MESSAGE_TEMPLATE_KEY] = $postMessage;
          return $this;
      }
code: public function setPostMessageTemplate($postMessage = null)
      {
          if (null !== $postMessage) {
              $postMessage = (string) $postMessage;
          }
          $this->abstractOptions['messageTemplates']
                                [self::POST_MESSAGE_TEMPLATE_KEY] = $postMessage;
          return $this;
      }
code_tokens: public function setPostMessageTemplate ( $ postMessage = null ) { if ( null !== $ postMessage ) { $ postMessage = ( string ) $ postMessage ; } $ this -> abstractOptions [ 'messageTemplates' ] [ self :: POST_MESSAGE_TEMPLATE_KEY ] = $ postMessage ; return $ this ; }
docstring: Sets template of validation failure message to be inserted at end of
  validation failure message map.
  
  Use null to specify no message should be inserted.
  
  @param string|null $postMessage
  @return self
docstring_tokens: Sets template of validation failure message to be inserted at end of validation failure message map .