<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >保留字列表</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="函数别名列表" HREF="aliases.html"><LINK REL="NEXT" TITLE="预定义变量" HREF="reserved.variables.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="aliases.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="reserved.variables.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="appendix" ><H1 ><A NAME="reserved" >附录 L. 保留字列表</A ></H1 ><DIV CLASS="TOC" ><DL ><DT ><B >目录</B ></DT ><DT ><A HREF="reserved.html#reserved.keywords" >关键词列表</A ></DT ><DT ><A HREF="reserved.variables.html" >预定义变量</A ></DT ><DT ><A HREF="reserved.classes.html" >预定义类</A ></DT ><DT ><A HREF="reserved.constants.html" >预定义常量</A ></DT ></DL ></DIV ><P > 以下是 PHP 中预定义标识符的列表。没有列在下面的标识符可以在脚本中作为自定义标识符使用。这些列表包括关键字和预定义变量、常量和类名。这些列表可能有遗漏,它是不完整的。 </P ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="reserved.keywords" >关键词列表</A ></H1 ><P > 这些词语在 PHP 中有着特殊的意义。它们中有些像是函数,有些像是常量……但是它们不是的,它们只是语言结构的一部分。不能使用它们的任何一个作为常量、方法名或是类名。但是可以将它们作为变量名使用,不过这样会导致混淆。 </P ><DIV CLASS="table" ><A NAME="AEN298466" ></A ><P ><B >表 L-1. PHP 关键词</B ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><COL><COL><COL><TBODY ><TR ><TD > <A HREF="language.operators.logical.html" >and</A > </TD ><TD > <A HREF="language.operators.logical.html" >or</A > </TD ><TD > <A HREF="language.operators.logical.html" >xor</A > </TD ><TD > <A HREF="language.constants.predefined.html" >__FILE__</A > </TD ><TD > <A HREF="reserved.classes.html#reserved.classes.php5" >exception</A > (PHP 5) </TD ></TR ><TR ><TD > <A HREF="language.constants.predefined.html" >__LINE__</A > </TD ><TD > <A HREF="function.array.html" ><B CLASS="function" >array()</B ></A > </TD ><TD > <A HREF="control-structures.foreach.html" >as</A > </TD ><TD > <A HREF="control-structures.break.html" >break</A > </TD ><TD > <A HREF="control-structures.switch.html" >case</A > </TD ></TR ><TR ><TD > <A HREF="language.oop.html#keyword.class" >class</A > </TD ><TD > <A HREF="language.oop5.constants.html" >const</A > </TD ><TD > <A HREF="control-structures.continue.html" >continue</A > </TD ><TD > <A HREF="control-structures.declare.html" >declare</A > </TD ><TD > <A HREF="control-structures.switch.html" >default</A > </TD ></TR ><TR ><TD > <A HREF="function.die.html" ><B CLASS="function" >die()</B ></A > </TD ><TD > <A HREF="control-structures.do.while.html" >do</A > </TD ><TD > <A HREF="function.echo.html" ><B CLASS="function" >echo()</B ></A > </TD ><TD > <A HREF="control-structures.else.html" >else</A > </TD ><TD > <A HREF="control-structures.elseif.html" >elseif</A > </TD ></TR ><TR ><TD > <A HREF="function.empty.html" ><B CLASS="function" >empty()</B ></A > </TD ><TD > <A HREF="control-structures.declare.html" >enddeclare</A > </TD ><TD > <A HREF="control-structures.alternative-syntax.html" >endfor</A > </TD ><TD > <A HREF="control-structures.alternative-syntax.html" >endforeach</A > </TD ><TD > <A HREF="control-structures.alternative-syntax.html" >endif</A > </TD ></TR ><TR ><TD > <A HREF="control-structures.alternative-syntax.html" >endswitch</A > </TD ><TD > <A HREF="control-structures.alternative-syntax.html" >endwhile</A > </TD ><TD > <A HREF="function.eval.html" ><B CLASS="function" >eval()</B ></A > </TD ><TD > <A HREF="function.exit.html" ><B CLASS="function" >exit()</B ></A > </TD ><TD > <A HREF="language.oop.html#keyword.class" >extends</A > </TD ></TR ><TR ><TD > <A HREF="control-structures.for.html" >for</A > </TD ><TD > <A HREF="control-structures.foreach.html" >foreach</A > </TD ><TD > <A HREF="language.functions.html#functions.user-defined" >function</A > </TD ><TD > <A HREF="language.variables.scope.html" >global</A > </TD ><TD > <A HREF="language.control-structures.html#control-structures.if" >if</A > </TD ></TR ><TR ><TD > <A HREF="function.include.html" ><B CLASS="function" >include()</B ></A > </TD ><TD > <A HREF="function.include-once.html" ><B CLASS="function" >include_once()</B ></A > </TD ><TD > <A HREF="function.isset.html" ><B CLASS="function" >isset()</B ></A > </TD ><TD > <A HREF="function.list.html" ><B CLASS="function" >list()</B ></A > </TD ><TD > <A HREF="language.oop.html#keyword.class" >new</A > </TD ></TR ><TR ><TD > <A HREF="function.print.html" ><B CLASS="function" >print()</B ></A > </TD ><TD > <A HREF="function.require.html" ><B CLASS="function" >require()</B ></A > </TD ><TD > <A HREF="function.require-once.html" ><B CLASS="function" >require_once()</B ></A > </TD ><TD > <A HREF="function.return.html" ><B CLASS="function" >return()</B ></A > </TD ><TD > <A HREF="language.variables.scope.html" >static</A > </TD ></TR ><TR ><TD > <A HREF="control-structures.switch.html" >switch</A > </TD ><TD > <A HREF="function.unset.html" ><B CLASS="function" >unset()</B ></A > </TD ><TD > use </TD ><TD > <A HREF="language.oop.html#keyword.class" >var</A > </TD ><TD > <A HREF="control-structures.while.html" >while</A > </TD ></TR ><TR ><TD > <A HREF="language.constants.predefined.html" >__FUNCTION__</A > </TD ><TD > <A HREF="language.constants.predefined.html" >__CLASS__</A > </TD ><TD > <A HREF="language.constants.predefined.html" >__METHOD__</A > </TD ><TD > <A HREF="language.oop5.final.html" >final</A > (PHP 5) </TD ><TD > <A HREF="reserved.classes.html#reserved.classes.php5" >php_user_filter</A > (PHP 5) </TD ></TR ><TR ><TD > <A HREF="language.oop5.interfaces.html" >interface</A > (PHP 5) </TD ><TD > <A HREF="language.oop5.interfaces.html" >implements</A > (PHP 5) </TD ><TD > <A HREF="language.oop5.basic.html" >extends</A > </TD ><TD > <A HREF="language.oop5.visibility.html" >public</A > (PHP 5) </TD ><TD > <A HREF="language.oop5.visibility.html" >private</A > (PHP 5) </TD ></TR ><TR ><TD > <A HREF="language.oop5.visibility.html" >protected</A > (PHP 5) </TD ><TD > <A HREF="language.oop5.abstract.html" >abstract</A > (PHP 5) </TD ><TD > <A HREF="language.oop5.cloning.html" >clone</A > (PHP 5) </TD ><TD > <A HREF="language.exceptions.html" >try</A > (PHP 5) </TD ><TD > <A HREF="language.exceptions.html" >catch</A > (PHP 5) </TD ></TR ><TR ><TD > <A HREF="language.exceptions.html" >throw</A > (PHP 5) </TD ><TD > <A HREF="migration.old-function.html" >cfunction</A > (PHP 4 only) </TD ><TD > <A HREF="migration.old-function.html" >old_function</A > (PHP 4 only) </TD ><TD > <A HREF="language.oop.html#keyword.class" >this</A > (PHP 5 only) </TD ><TD > </TD ></TR ></TBODY ></TABLE ></DIV ></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="aliases.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="reserved.variables.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >函数别名列表</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="appendices.html" ACCESSKEY="U" >上一级</A ></TD ><TD 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