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127 lines
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HTML
127 lines
5.3 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>返回分配给 PHP 的内存量</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.memory-get-usage" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">memory_get_usage</h1>
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<p class="verinfo">(PHP 4 >= 4.3.2, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">memory_get_usage</span> — <span class="dc-title">返回分配给 PHP 的内存量</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.memory-get-usage-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>memory_get_usage</strong></span>
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([ <span class="methodparam"><span class="type">bool</span> <code class="parameter">$real_usage</code><span class="initializer"> = false</span></span>
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] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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返回当前分配给你的 PHP 脚本的内存量，单位是字节（byte）。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.memory-get-usage-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">real_usage</code></dt>
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<dd>
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<p class="para">
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如果设置为 <strong><code>TRUE</code></strong>，获取系统分配总的内存尺寸，包括未使用的页。如果未设置或者设置为 <strong><code>FALSE</code></strong>，仅仅报告实际使用的内存量。
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</p>
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</dd>
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</dl>
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">PHP 不跟踪非<em>emalloc()</em> 分配的内存</p>
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</p></blockquote>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.memory-get-usage-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回内存量字节数。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.memory-get-usage-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.2.1</td>
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<td>
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不需要在编译时使用 <a href="ini.core.html#ini.memory-limit" class="link">--enable-memory-limit</a> 选项就能够使用这个函数。
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</td>
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</tr>
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<tr>
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<td>5.2.0</td>
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<td>
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增加了参数 <code class="parameter">real_usage</code>。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.memory-get-usage-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-517">
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<p><strong>Example #1 一个 <span class="function"><strong>memory_get_usage()</strong></span> 例子</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">//这只是个例子，下面的数字取决于你的系统<br /><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">memory_get_usage</span><span style="color: #007700">() . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 36640<br /><br /></span><span style="color: #0000BB">$a </span><span style="color: #007700">= </span><span style="color: #0000BB">str_repeat</span><span style="color: #007700">(</span><span style="color: #DD0000">"Hello"</span><span style="color: #007700">, </span><span style="color: #0000BB">4242</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">memory_get_usage</span><span style="color: #007700">() . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 57960<br /><br /></span><span style="color: #007700">unset(</span><span style="color: #0000BB">$a</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">memory_get_usage</span><span style="color: #007700">() . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 36744<br /><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 seealso" id="refsect1-function.memory-get-usage-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"><span class="function"><a href="memory_get_peak_usage.html" class="function" rel="rdfs-seeAlso">memory_get_peak_usage()</a> - 返回分配给 PHP 内存的峰值</span></li>
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<li class="member"><a href="ini.core.html#ini.memory-limit" class="link">memory_limit</a></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> |