Скпипт для рекурсивной замены текста в файлах.

 <?

  class soReplacer
  {
    protected $_sWhat			= '';
    protected $_sForWhat		= '';
    
    /**
	* Замена
	* 
	* @param string $sFilePath
	* 
	* @return void
	*/
    protected function _replace($sFilePath) 
    {
      file_put_contents( $sFilePath,
        str_replace($this->_sWhat, $this->_sForWhat, 
          file_get_contents($sFilePath)
        )
      );
    }

    /**
	* Перебор ФС
	* 
	* @param string $sPath
	* 
	* @return void
	*/
    protected function _scan($sPath) 
    {
      $d = dir($sPath);
      while (false !== ($entry = $d->read()))
      {
        $sCurrPath = $sPath.'/'.$entry;
        if ($entry != '.' && $entry != '..')
        {
          if (is_dir($sCurrPath))
          {
            $this->_scan($sCurrPath);
            //-- rmdir ($sCurrPath);
          }
          else
          {
            echo $sCurrPath."\n"; // <br />
            //-- unlink($sCurrPath);
            $this->_replace($sCurrPath);
          }
        }

      }
	  $d->close();
    }

    /**
	* Init
	* 
	* @param string $sPath
	* @param string $sWhat
	* @param string $sForWhat
	* 
	* @return void
	*/
    public function go($sPath, $sWhat, $sForWhat) 
    {
      $this->_sWhat = $sWhat;
      $this->_sForWhat = $sForWhat;

      $this->_scan( $sPath );
    }
  }
  
  $oReplacer = new soReplacer();
  $oReplacer->go(
    __DIR__,
    '/zzz2',
    '/zzz2'
  );