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115 lines
8.9 KiB
HTML
115 lines
8.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>获取当前的PHP版本</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.phpversion" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">phpversion</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">phpversion</span> — <span class="dc-title">获取当前的PHP版本</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.phpversion-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>phpversion</strong></span>
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([ <span class="methodparam"><span class="type">string</span> <code class="parameter">$extension</code></span>
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] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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返回了包含当前运行 PHP 解释器或扩展版本信息的 string。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.phpversion-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">extension</code></dt>
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<dd>
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<p class="para">
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可选的扩展名。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.phpversion-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果指定了可选参数 <code class="parameter">extension</code>，<span class="function"><strong>phpversion()</strong></span>会返回该扩展的版本。
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如果没有对应的版本信息，或者该扩展未启用，则返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.phpversion-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-528">
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<p><strong>Example #1 <span class="function"><strong>phpversion()</strong></span> 范例</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// prints e.g. 'Current PHP version: 4.1.1'<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">'Current PHP version: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">phpversion</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">// prints e.g. '2.0' or nothing if the extension isn't enabled<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">phpversion</span><span style="color: #007700">(</span><span style="color: #DD0000">'tidy'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-529">
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<p><strong>Example #2 <strong><code>PHP_VERSION_ID</code></strong> 范例和用法</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// PHP_VERSION_ID 自 PHP 5.2.7 起有效，<br />// 如果我们的版本低于该版本，则用以下代码来模拟 <br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">defined</span><span style="color: #007700">(</span><span style="color: #DD0000">'PHP_VERSION_ID'</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$version </span><span style="color: #007700">= </span><span style="color: #0000BB">explode</span><span style="color: #007700">(</span><span style="color: #DD0000">'.'</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_VERSION</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">define</span><span style="color: #007700">(</span><span style="color: #DD0000">'PHP_VERSION_ID'</span><span style="color: #007700">, (</span><span style="color: #0000BB">$version</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">] * </span><span style="color: #0000BB">10000 </span><span style="color: #007700">+ </span><span style="color: #0000BB">$version</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">] * </span><span style="color: #0000BB">100 </span><span style="color: #007700">+ </span><span style="color: #0000BB">$version</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]));<br />}<br /><br /></span><span style="color: #FF8000">// PHP_VERSION_ID 定义为一个数字，PHP 版本越新，数字越大。<br />// 它的定义是以下的表达式：<br />//<br />// $version_id = $major_version * 10000 + $minor_version * 100 + $release_version;<br />//<br />// 现在我们可以通过 PHP_VERSION_ID 来检查 PHP 版本，<br />// 而不用每次都必须用 version_compare() 来检查 PHP 是否支持某个功能。<br />//<br />// 比如，我们在此可以定义一系列 PHP_VERSION_* constants 常量，<br />// 而在 5.2.7 之前的版本并没有被定义。<br /><br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">PHP_VERSION_ID </span><span style="color: #007700">< </span><span style="color: #0000BB">50207</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">define</span><span style="color: #007700">(</span><span style="color: #DD0000">'PHP_MAJOR_VERSION'</span><span style="color: #007700">, </span><span style="color: #0000BB">$version</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /> </span><span style="color: #0000BB">define</span><span style="color: #007700">(</span><span style="color: #DD0000">'PHP_MINOR_VERSION'</span><span style="color: #007700">, </span><span style="color: #0000BB">$version</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /> </span><span style="color: #0000BB">define</span><span style="color: #007700">(</span><span style="color: #DD0000">'PHP_RELEASE_VERSION'</span><span style="color: #007700">, </span><span style="color: #0000BB">$version</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]);<br /><br /> </span><span style="color: #FF8000">// 等等， ...<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.phpversion-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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这些信息也存在于预定义常量 <strong><code>PHP_VERSION</code></strong>里。
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更多版本的信息可以使用常量 <strong><code>PHP_VERSION_*</code></strong>。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.phpversion-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><a href="reserved.constants.html#reserved.constants.core" class="link">常量 PHP_VERSION</a></li>
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<li class="member"><span class="function"><a href="version_compare.html" class="function" rel="rdfs-seeAlso">version_compare()</a> - 对比两个「PHP 规范化」的版本数字字符串</span></li>
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<li class="member"><span class="function"><a href="phpinfo.html" class="function" rel="rdfs-seeAlso">phpinfo()</a> - 输出关于 PHP 配置的信息</span></li>
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<li class="member"><span class="function"><a href="phpcredits.html" class="function" rel="rdfs-seeAlso">phpcredits()</a> - 打印 PHP 贡献者名单</span></li>
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<li class="member"><span class="function"><a href="php_logo_guid.html" class="function" rel="rdfs-seeAlso">php_logo_guid()</a> - 获取 logo 的 guid</span></li>
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<li class="member"><span class="function"><a href="zend_version.html" class="function" rel="rdfs-seeAlso">zend_version()</a> - 获取当前 Zend 引擎的版本</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |