现在很多PHP程序都需要ZendOptimizer环境，但是ZendOptimizer在PHP5.2之后已经被支持，那怎么办，Zend也不会这么做，原来PHP5.3开始ZendOptimizer正式改为Zend Guard Loader。
Zend Guard Loader的发布，而且Zend Optimizer不会再更新，并且由于差异很大使用Zend Guard加密代码时将提示你是否使用php5.3，如果使用5.3那么代码就无法在php5.2上运行。
Zend Guard Loader安装说明
下载Zend Guard Loader包
(官方地址:http://www.zend.com/en/products/guard/downloads)
Linux:
x86:http://downloads.zend.com/guard/5.5.0/ZendGuardLoader-php-5.3-linux-glibc23-i386.tar.gz
x64:http://downloads.zend.com/guard/5.5.0/ZendGuardLoader-php-5.3-linux-glibc23-x86_64.tar.gz
Windows:
http://downloads.zend.com/guard/5.5.0/ZendGuardLoader-php-5.3-Windows.zip
并提取ZendGuardLoader.so（Linux）或ZendLoader.dll（Windows）上传到服务器。
加载ZendGuardLoader,配置PHP.INI
例子:
zend_extension=C:\web\PHP\ext\ZendLoader.dll
zend_loader.enable=1
zend_loader.disable_licensing=0
zend_loader.obfuscation_level_support=3
zend_loader.license_path=
下面逐一说明：
注意windows版的只支持NTS(非线程安全)版的PHP5.3,即phpinfo中Thread Safety为disabled的！
在你的php.ini文件中添加以下行：
;Linux和Mac OS X：
zend_extension=
;Windows的非线程安全的：
zend_extension=
添加下面这行加载ZendGuardLoader:
;启用加载编码脚本。默认开启
zend_loader.enable=1
可选：配置ZendGuardLoader
;禁用检查授权（出于性能原因）
zend_loader.disable_licensing=0
;配置混淆水平 0 - 不支持混淆
zend_loader.obfuscation_level_support=3
;配置寻找授权文件的路径
zend_loader.license_path=
如果你同时使用Zend debugger,请保证加载Zend guard Loader后再加载Zend debugger
如果你同时使用Ioncube loader,请保证加载Ioncube loader后再加载Zend guard Loader
重启Web服务。
如果在phpinfo中看到如下内容（不同的版本可能会有所不同）：
This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.4.0, Copyright (c) 1998-2011 Zend Technologies
说明安装已经成功！
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