If you want Zend encrypted code to run on PHP 5.3.x, you must choose PHP 5.3 encryption, and the old encrypted file cannot run on PHP 5.3. At the same time, if it is a Windows platform, you must also choose the NTS version of PHP. The corresponding Zend decryption plug-in is Zend Loader. It requires all manual installation. After obtaining Zendloader.dll, modify the PHP file and add the following two lines: Zend _ extension = "(the path of Zendloader.dll)" zend_loader.enable= 1.

And if you want Zend encryption code to run on the platform before PHP 5.3, you must choose to encrypt for the old version of PHP. Code encrypted for PHP 5.3 cannot run on platforms before PHP 5.3.

At the same time, if it is a Windows platform, you must also choose the TS version of PHP. The corresponding Zend decryption plug-in is Zend Optimizer.

There is an installer that needs to be installed by yourself.