<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >从 PHP 3 移植到 PHP 4</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="错误报告" HREF="migrating5.errorrep.html"><LINK REL="NEXT" TITLE="同时运行 PHP 3 和 PHP 4" HREF="migration4.php4.with.php3.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="migrating5.errorrep.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="migration4.php4.with.php3.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="appendix" ><H1 ><A NAME="migration4" >附录 D. 从 PHP 3 移植到 PHP 4</A ></H1 ><DIV CLASS="TOC" ><DL ><DT ><B >目录</B ></DT ><DT ><A HREF="migration4.html#migration4.changes" >PHP 4 所作的改变</A ></DT ><DT ><A HREF="migration4.php4.with.php3.html" >同时运行 PHP 3 和 PHP 4</A ></DT ><DT ><A HREF="migration4.configuration.html" >移植配置文件</A ></DT ><DT ><A HREF="migration4.parser.html" >解析器行为</A ></DT ><DT ><A HREF="migration4.error-reporting.html" >错误报告</A ></DT ><DT ><A HREF="migration4.initializers.html" >初始化</A ></DT ><DT ><A HREF="migration4.empty.html" ><TT CLASS="literal" >empty("0")</TT ></A ></DT ><DT ><A HREF="migration4.missing.html" >缺少的函数</A ></DT ><DT ><A HREF="migration4.extensions.html" >PHP 3 扩展</A ></DT ><DT ><A HREF="migration4.strings.html" >字符串中的变量替换</A ></DT ><DT ><A HREF="migration4.cookies.html" >Cookies</A ></DT ><DT ><A HREF="migration4.variables.html" >处理全局变量</A ></DT ></DL ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="migration4.changes" >PHP 4 所作的改变</A ></H1 ><P > 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。 </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="migrating5.errorrep.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="migration4.php4.with.php3.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >错误报告</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" >同时运行 PHP 3 和 PHP 4</TD ></TR ></TABLE ></DIV ></BODY ></HTML >