In this tutorial I will tell you how to work with Zend Optimizer (Runtime for PHP 5.2 and earlier) module for PHP. We can download from below URL. Zend Optimizer is a free application that runs the files encoded using Zend Guard and enhances the overall performance of our PHP applications.
Download Here

Below is the simple steps to install Zend Optimizer.

Step 1: You can download ZendLoader which compatible with my PHP version.

http://www.zend.com/en/products/guard/downloads

Step 2- Copied the ZendLoader.dll and paste to into PHP extention folder.

D:\wamp\bin\php\php5.3.5\ext\

Step 3- added below lines into php.ini file.

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;zend loader
zend_loader.enable=1
zend_extension = "d:/wamp/bin/php/php5.4.3/zend_ext/ZendLoader.dll"

Result:

When you check php info then you will get below value.