The solution of the urgent request PHP encryption method

Urgent Request PHP Encryption method
I now write a program because there is a commercial, so it must be encrypted, but on-line Zend Encryption Phpcodelock
Algorithm encryption, are can be cracked, online please expert guidance, if encrypted PHP source code AH? In the short term can not be cracked ah?

------Solution--------------------
Generally referred to the encryption many people will use the MD5, simple, to use, and can not be anti-crack, but can be brute force, after all, simple one-way encryption?
Most of the encryption will still use the two-way encryption with a secret key, in PHP is better than the DES encryption algorithm. You are using the MCrypt extension library.
LZ can go online to collect.

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