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>附录 D. 从 PHP 3 移植到 PHP 4</A
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>目录</B
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><DT
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>PHP 4 所作的改变</A
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>同时运行 PHP 3 和 PHP 4</A
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>移植配置文件</A
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>解析器行为</A
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>错误报告</A
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>初始化</A
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>缺少的函数</A
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>PHP 3 扩展</A
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>字符串中的变量替换</A
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>Cookies</A
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>处理全局变量</A
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>PHP 4 所作的改变</A
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> PHP 4 和其整合的 Zend engine 极大的增强了 PHP
的性能和兼容性，对细节代码也十分注意。所以从 PHP 3 到 PHP 4
的移植要比从 PHP/FI 2 到 PHP 3 的移植容易得多。很多 PHP 3
的代码无需修改就可以在 PHP 4
中运行，但是还是需要在转换程序运行环境时注意一些细节。下面就是一些提示。
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