What is Zend Optimizer?
Zend Optimizer is an open source runtime application used with file scripts encoded by Zend Encoder and Zend Safeguard to increase the overall runtime speed of PHP applications.
Zend Optimizer decrypts an encrypted code by converting plain text PHP into Zend intermediate code, a binary format. Zend Optimizer interprets the encrypted code to run encrypted applications.
Zend Optimizer requires PHP host server support when running encrypted PHP applications. Although the code runs every time a page is executed, there is a minor, but not noticeable, overhead. A supported host server improves the speed of PHP code execution by optimizing code, which increases the speed of execution without changing the code.