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>CLXVII. Tokenizer Functions</H1
><DIV
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><A
NAME="AEN235301"
></A
><DIV
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><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
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><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
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><DIV
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><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
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><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
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><P
><B
>例 1. Strip comments with the tokenizer</B
></P
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><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>
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><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
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