<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Tokenizer Functions</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="函数参考" HREF="funcref.html"><LINK REL="PREVIOUS" TITLE="tidyNode::getParent" HREF="function.tidynode-getparent.html"><LINK REL="NEXT" TITLE="token_get_all" HREF="function.token-get-all.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="reference" 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="function.tidynode-getparent.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="function.token-get-all.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="reference" ><A NAME="ref.tokenizer" ></A ><DIV CLASS="TITLEPAGE" ><H1 CLASS="title" >CLXVII. Tokenizer Functions</H1 ><DIV CLASS="PARTINTRO" ><A NAME="AEN235301" ></A ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="tokenizer.intro" >简介</A ></H1 ><P > The tokenizer functions provide an interface to the PHP tokenizer embedded in the Zend Engine. Using these functions you may write your own PHP source analyzing or modification tools without having to deal with the language specification at the lexical level. </P ><P > See also the <A HREF="tokens.html" >appendix about tokens</A >. </P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="tokenizer.requirements" >需求</A ></H1 ><P >要编译本扩展模块无需外部库文件。</P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="tokenizer.installation" >安装</A ></H1 ><P > Beginning with PHP 4.3.0 these functions are enabled by default. For older versions you have to configure and compile PHP with <CODE CLASS="option" >--enable-tokenizer</CODE >. You can disable tokenizer support with <CODE CLASS="option" >--disable-tokenizer</CODE >. </P ><P > <TT CLASS="literal" >PHP</TT > 的 Windows 版本已经内置该扩展模块的支持。无需加载任何附加扩展库即可使用这些函数。</P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B > Built-in support for tokenizer is available as of PHP 4.3.0. </P ></BLOCKQUOTE ></DIV ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="tokenizer.constants" >预定义常量</A ></H1 ><P > When the extension has either been compiled into PHP or dynamically loaded at runtime, the tokens listed in <A HREF="tokens.html" >附录 R</A > are defined as constants. </P ></DIV ><DIV CLASS="section" ><H1 CLASS="section" ><A NAME="tokenizer.examples" >范例</A ></H1 ><P > Here is a simple example PHP scripts using the tokenizer that will read in a PHP file, strip all comments from the source and print the pure code only. </P ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN235326" ></A ><P ><B >例 1. Strip comments with the tokenizer</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">/*<br /> * T_ML_COMMENT does not exist in PHP 5.<br /> * The following three lines define it in order to<br /> * preserve backwards compatibility.<br /> *<br /> * The next two lines define the PHP 5 only T_DOC_COMMENT,<br /> * which we will mask as T_ML_COMMENT for PHP 4.<br /> */<br /></font><font color="#007700">if (!</font><font color="#0000BB">defined</font><font color="#007700">(</font><font color="#DD0000">'T_ML_COMMENT'</font><font color="#007700">)) {<br /> </font><font color="#0000BB">define</font><font color="#007700">(</font><font color="#DD0000">'T_ML_COMMENT'</font><font color="#007700">, </font><font color="#0000BB">T_COMMENT</font><font color="#007700">);<br />} else {<br /> </font><font color="#0000BB">define</font><font color="#007700">(</font><font color="#DD0000">'T_DOC_COMMENT'</font><font color="#007700">, </font><font color="#0000BB">T_ML_COMMENT</font><font color="#007700">);<br />}<br /><br /></font><font color="#0000BB">$source </font><font color="#007700">= </font><font color="#0000BB">file_get_contents</font><font color="#007700">(</font><font color="#DD0000">'example.php'</font><font color="#007700">);<br /></font><font color="#0000BB">$tokens </font><font color="#007700">= </font><font color="#0000BB">token_get_all</font><font color="#007700">(</font><font color="#0000BB">$source</font><font color="#007700">);<br /><br />foreach (</font><font color="#0000BB">$tokens </font><font color="#007700">as </font><font color="#0000BB">$token</font><font color="#007700">) {<br /> if (</font><font color="#0000BB">is_string</font><font color="#007700">(</font><font color="#0000BB">$token</font><font color="#007700">)) {<br /> </font><font color="#FF8000">// simple 1-character token<br /> </font><font color="#007700">echo </font><font color="#0000BB">$token</font><font color="#007700">;<br /> } else {<br /> </font><font color="#FF8000">// token array<br /> </font><font color="#007700">list(</font><font color="#0000BB">$id</font><font color="#007700">, </font><font color="#0000BB">$text</font><font color="#007700">) = </font><font color="#0000BB">$token</font><font color="#007700">;<br /> <br /> switch (</font><font color="#0000BB">$id</font><font color="#007700">) { <br /> case </font><font color="#0000BB">T_COMMENT</font><font color="#007700">: <br /> case </font><font color="#0000BB">T_ML_COMMENT</font><font color="#007700">: </font><font color="#FF8000">// we've defined this<br /> </font><font color="#007700">case </font><font color="#0000BB">T_DOC_COMMENT</font><font color="#007700">: </font><font color="#FF8000">// and this<br /> // no action on comments<br /> </font><font color="#007700">break;<br /><br /> default:<br /> </font><font color="#FF8000">// anything else -> output "as is"<br /> </font><font color="#007700">echo </font><font color="#0000BB">$text</font><font color="#007700">;<br /> break;<br /> }<br /> }<br />}<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ></DIV ></DIV ><DIV CLASS="TOC" ><DL ><DT ><B >目录</B ></DT ><DT ><A HREF="function.token-get-all.html" >token_get_all</A > -- Split given source into PHP tokens</DT ><DT ><A HREF="function.token-name.html" >token_name</A > -- Get the symbolic name of a given PHP token</DT ></DL ></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="function.tidynode-getparent.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="function.token-get-all.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >tidyNode::getParent</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="funcref.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >token_get_all</TD ></TR ></TABLE ></DIV ></BODY ></HTML >