NormalizeMagicQuotesGpc.php

<?php
require_once 'Zend/Filter/Interface.php';

class My_Filter_NormalizeMagicQuotesGpc implements Zend_Filter_Interface
{
  protected $_flag ;

  public function __construct( $flag = false )
  {
    $this->_flag  = ( boolean ) $flag ;
  }

  public function getMagicQuotesGpc()
  {
    return  $this->_flag ;
  }

  public function setMagicQuotesGpc( $flag )
  {
    $this->_flag  = ( boolean ) $flag ;
    return  $this ;
  }

  public function filter( $value )
  {
    if( ( ! $this->_flag ) && ( get_magic_quotes_gpc() ) ) {
      $value  = stripslashes( $value ) ;
    } else if( ( $this->_flag ) && ( ! get_magic_quotes_gpc() ) ) {
      $value  = addslashes( $value ) ;
    }
    return  $value ;
  }
}