original_string: protected function getPersistentContent()
      {
          if (!$this->persistent || null === ($value = $this->getValue())) {
              return '';
          }
          return '<input type="hidden"' . self::getAttributesString(array(
              'name'  => $this->getName(),
              'value' => $value,
              'id'    => $this->getId()
          )) . ' />';
      }
code: protected function getPersistentContent()
      {
          if (!$this->persistent || null === ($value = $this->getValue())) {
              return '';
          }
          return '<input type="hidden"' . self::getAttributesString(array(
              'name'  => $this->getName(),
              'value' => $value,
              'id'    => $this->getId()
          )) . ' />';
      }
code_tokens: protected function getPersistentContent ( ) { if ( ! $ this -> persistent || null === ( $ value = $ this -> getValue ( ) ) ) { return '' ; } return '<input type="hidden"' . self :: getAttributesString ( array ( 'name' => $ this -> getName ( ) , 'value' => $ value , 'id' => $ this -> getId ( ) ) ) . ' />' ; }
docstring: Generates hidden form field containing the element's value
  
  This is used to pass the frozen element's value if 'persistent freeze'
  feature is on
  
  @return string
docstring_tokens: Generates hidden form field containing the element s value