📄 function.memory-get-usage.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Returns the amount of memory allocated to PHP</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.memory-get-peak-usage.html">memory_get_peak_usage</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.php-ini-loaded-file.html">php_ini_loaded_file</a></div> <div class="up"><a href="ref.info.html">PHP Options/Info Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.memory-get-usage" class="refentry"> <div class="refnamediv"> <h1 class="refname">memory_get_usage</h1> <p class="verinfo">(PHP 4 >= 4.3.2, PHP 5)</p><p class="refpurpose"><span class="refname">memory_get_usage</span> — <span class="dc-title">Returns the amount of memory allocated to PHP</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>memory_get_usage</b></b></span> ([ <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$real_usage</tt></span> ] )</div> <p class="para rdfs-comment"> Returns the amount of memory, in bytes, that's currently being allocated to your PHP script. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">real_usage</tt></i></span> <dd> <p class="para"> Set this to <b><tt>TRUE</tt></b> to get the real size of memory allocated from system. If not set or <b><tt>FALSE</tt></b> only the memory used by <i>emalloc()</i> is reported. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the memory amount in bytes. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.2.1</td> <td colspan="1" rowspan="1" align="left"> Compiling with <a href="ini.core.html#ini.memory-limit" class="link">--enable-memory-limit</a> is no longer required for this function to exist. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.2.0</td> <td colspan="1" rowspan="1" align="left"> <i><tt class="parameter">real_usage</tt></i> was added. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 A <b>memory_get_usage()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// This is only an example, the numbers below will<br />// differ depending on your system<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></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.memory-get-peak-usage.html" class="function" rel="rdfs-seeAlso">memory_get_peak_usage()</a></li> <li class="member"><a href="ini.core.html#ini.memory-limit" class="link">memory_limit</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.memory-get-peak-usage.html">memory_get_peak_usage</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.php-ini-loaded-file.html">php_ini_loaded_file</a></div> <div class="up"><a href="ref.info.html">PHP Options/Info Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -