<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >从 PHP 4 移植到 PHP 5</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="Appendices" HREF="appendices.html"><LINK REL="PREVIOUS" TITLE="Other Enhancements" HREF="migration52.other.html"><LINK REL="NEXT" TITLE="未向下兼容的改变" HREF="migration5.incompatible.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="appendix" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="migration52.other.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="migration5.incompatible.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="appendix" ><H1 ><A NAME="migration5" >附录 C. 从 PHP 4 移植到 PHP 5</A ></H1 ><DIV CLASS="TOC" ><DL ><DT ><B >目录</B ></DT ><DT ><A HREF="migration5.html#migration5.changes" >PHP 5 中有哪些改变</A ></DT ><DT ><A HREF="migration5.incompatible.html" >未向下兼容的改变</A ></DT ><DT ><A HREF="migration5.cli-cgi.html" >CLI 和 CGI</A ></DT ><DT ><A HREF="migration5.configuration.html" >移植配置文件</A ></DT ><DT ><A HREF="migration5.functions.html" >新函数</A ></DT ><DT ><A HREF="migration5.newconf.html" >新指令</A ></DT ><DT ><A HREF="migration5.databases.html" >数据库</A ></DT ><DT ><A HREF="migration5.oop.html" >新对象模型</A ></DT ><DT ><A HREF="migrating5.errorrep.html" >错误报告</A ></DT ></DL ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="migration5.changes" >PHP 5 中有哪些改变</A ></H1 ><P > PHP 5 和集成的 Zend Engine 2 代极大提高了 PHP 的性能和能力,而且投入极大努力尽可能避免破坏已有的代码的使用。因此将代码从 PHP 4 移植到 PHP 5 应该很容易。大多数已有的 PHP 4 代码应该不用改就能运行,但还是应该注意到<A HREF="migration5.incompatible.html" >几点区别</A >并在实际运作环境下转换到新版本之前多做测试。 </P ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="migration52.other.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="migration5.incompatible.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Other Enhancements</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="appendices.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >未向下兼容的改变</TD ></TR ></TABLE ></DIV ></BODY ></HTML >