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<p class="menu"><a href="../mod/index.html">模块索引</a> | <a href="../mod/directives.html">指令索引</a> | <a href="../faq/index.html">常见问题</a> | <a href="../glossary.html">词汇表</a> | <a href="../sitemap.html">站点导航</a></p><p class="apache">Apache HTTP Server 版本2.2</p><img alt="" src="../images/feather.gif" /></div>
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<div id="page-content"><div id="preamble"><h1>Apache模块 mod_version</h1>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="module">
<tr><th><a href="module-dict.html#Description">说明</a></th><td>提供基于版本的配置段支持</td></tr>
<tr><th><a href="module-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">模块名</a></th><td>version_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">源文件</a></th><td>mod_version.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">兼容性</a></th><td>仅在 Apache 2.0.56 及以后的版本中可用</td></tr>
</table>
<h3>概述</h3>
<p>This module is designed for the use in test suites and large
networks which have to deal with different httpd versions and
different configurations. It provides a new container -- <code class="directive"><a href="#ifversion"><IfVersion></a></code>, which
allows a flexible version checking including numeric comparisons and
regular expressions.</p>
<div class="example"><h3>例子</h3><p><code>
<IfVersion 2.1.0><br />
<span class="indent">
# current httpd version is exactly 2.1.0<br />
</span>
</IfVersion><br />
<br />
<IfVersion >= 2.2><br />
<span class="indent">
# use really new features :-)<br />
</span>
</IfVersion>
</code></p></div>
<p>See below for further possibilities.</p>
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<div class="directive-section"><h2><a name="IfVersion" id="IfVersion"><IfVersion></a> <a name="ifversion" id="ifversion">指令</a></h2>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="directive">
<tr><th><a href="directive-dict.html#Description">说明</a></th><td>contains version dependent configuration</td></tr>
<tr><th><a href="directive-dict.html#Syntax">语法</a></th><td><code><IfVersion [[!]<var>operator</var>] <var>version</var>> ...
</IfVersion></code></td></tr>
<tr><th><a href="directive-dict.html#Context">作用域</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">覆盖项</a></th><td>All</td></tr>
<tr><th><a href="directive-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="directive-dict.html#Module">模块</a></th><td>mod_version</td></tr>
</table>
<p><code class="directive"><IfVersion></code> section encloses
configuration directives which are executed only if the
<code class="program"><a href="../programs/httpd.html">httpd</a></code> version
matches the desired criteria. For normal (numeric) comparisons the
<var>version</var> argument has the format
<code><var>major</var>[.<var>minor</var>[.<var>patch</var>]]</code>, e.g.
<code>2.1.0</code>或<code>2.2</code>. <var>minor</var>和<var>patch</var> are optional. If these numbers are omitted, they are
assumed to be zero. The following numerical <var>operator</var>s are
possible:</p>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="bordered">
<tr class="header"><th><var>operator</var></th><th>description</th></tr>
<tr><td><code>=</code>或<code>==</code></td><td>httpd version is equal</td></tr>
<tr class="odd"><td><code>></code></td><td>httpd version is greater than</td></tr>
<tr><td><code>>=</code></td><td>httpd version is greater or equal</td></tr>
<tr class="odd"><td><code><</code></td><td>httpd version is less than</td></tr>
<tr><td><code><=</code></td><td>httpd version is less or equal</td></tr>
</table>
<div class="example"><h3>示例</h3><p><code>
<IfVersion >= 2.1><br />
<span class="indent">
# this happens only in versions greater or<br />
# equal 2.1.0.<br />
</span>
</IfVersion>
</code></p></div>
<p>Besides the numerical comparison it is possible to match a
<a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular expression</a>
against the httpd version. There are two ways to write it:</p>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="bordered">
<tr class="header"><th><var>operator</var></th><th>description</th></tr>
<tr><td><code>=</code>或<code>==</code></td><td><var>version</var> has the form
<code>/<var>regex</var>/</code></td></tr>
<tr class="odd"><td><code>~</code></td><td><var>version</var> has the form
<code><var>regex</var></code></td></tr>
</table>
<div class="example"><h3>示例</h3><p><code>
<IfVersion = /^2.1.[01234]$/><br />
<span class="indent">
# e.g. workaround for buggy versions
</span>
</IfVersion>
</code></p></div>
<p>In order to reverse the meaning, all operators can be preceded by an
exclamation mark (<code>!</code>):</p>
<div class="example"><p><code>
<IfVersion !~ ^2.1.[01234]$><br />
<span class="indent">
# not for those versions<br />
</span>
</IfVersion>
</code></p></div>
<p>If the <var>operator</var> is omitted, it is assumed to be
<code>=</code>.</p>
</div>
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