How to encrypt php files

This article describes in detail how to encrypt php files and what problems will arise. How to encrypt php files?
I would like to ask if there is any way to encrypt the php file. after the file is encrypted, garbled characters may occur when you open the php file, such as 01 and so on. then, the PHP file can run normally, it can be restored later. Is there any way?
Zend guard
ZendGuard, phpShield, SourceGuardian
Php's encryption software has this function, and there are still a lot of online searches.

Bytes
Encryption and decryption by using the public key and private key. The ssl module must be enabled for both Apache and php.

The preceding figure shows how to encrypt the PHP file. For more information, see PHP Chinese website (www.php1.cn )!