如何保护PHP代码？有些收费功能不希望开源发布
我想知道的是zend编译之外的方法，因为有些客户主机不支持zend编译后的代码。
系统是开源的，仅仅需要保护小部分收费功能，能不能封装成别的文件，例如：我见到过一个IP地址区域查询功能，那个数据库名称 tinyipdata.dat，然后可以用php查询，这样也可以在任何支持PHP的主机上运行。
回复讨论(解决方案)
用php代码访问的文件，可以任意命名
php代码本身也可以做一些自解码的扰码处理
php代码本身也可以做一些自解码的扰码处理
能不能给个简单的例子？
给个极简单的例子
eval(base64_decode('cGhwaW5mbygpOw=='));自己多琢磨琢磨
多层嵌套并配以凯撒加密，一般人就解不开了
多谢楼上老大，我已经实现了商业代码进行编码了。
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