解包
tar -zxvf ZendGuardLoader-php-5.3-linux-glibc23-x86_64.tar.gz
复制 ZendGuardLoader.so 至 PHP 扩展目录
cp ZendGuardLoader.so /path/to/extension_dir
编辑 php.ini
zend_extension=/path/to/extension_dir/no-debug-non-zts-20090626/ZendGuardLoader.so
Add an aditional line to your php.ini for enabling ZendGuardLoader
zend_loader.enable=1
Disable license checks (for performance reasons)
zend_loader.disable_licensing=0
The Obfuscation level supported by Zend Guard Loader. The levels are detailed in the official Zend Guard Documentation. 0 - no obfuscation is enabled
zend_loader.obfuscation_level_support=3
重启 apache (Restart your Web server)
php5.3 安装 Zend Guard Loader,布布扣,bubuko.com
原文：http://www.cnblogs.com/yjken/p/3921830.html