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<div class="refnamediv">
<h1 class="refname">memory_get_usage</h1>
<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">Returns the amount of memory allocated to PHP</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.memory-get-usage-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>memory_get_usage</strong></span>
([ <span class="methodparam"><span class="type">bool</span> <code class="parameter">$real_usage</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></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" id="refsect1-function.memory-get-usage-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">real_usage</code></dt>
<dd>
<p class="para">
Set this to <strong><code>TRUE</code></strong> to get total memory allocated from
system, including unused pages.
If not set or <strong><code>FALSE</code></strong> only the used memory is reported.
</p>
</dd>
</dl>
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">PHP does not track memory that is not allocated by <em>emalloc()</em></p>
</p></blockquote>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.memory-get-usage-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the memory amount in bytes.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.memory-get-usage-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.2.1</td>
<td>
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>
<td>5.2.0</td>
<td>
<code class="parameter">real_usage</code> was added.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.memory-get-usage-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-551">
<p><strong>Example #1 A <span class="function"><strong>memory_get_usage()</strong></span> example</strong></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" id="refsect1-function.memory-get-usage-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.memory-get-peak-usage.html" class="function" rel="rdfs-seeAlso">memory_get_peak_usage()</a> - Returns the peak of memory allocated by PHP</span></li>
<li class="member"><a href="ini.core.html#ini.memory-limit" class="link">memory_limit</a></li>
</ul>
</p>
</div>
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