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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.memory-get-usage" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>memory_get_usage</refname>
<refpurpose>Returns the amount of memory allocated to PHP</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>memory_get_usage</methodname>
<methodparam choice="opt"><type>bool</type><parameter>real_usage</parameter><initializer>false</initializer></methodparam>
</methodsynopsis>
<para>
Returns the amount of memory, in bytes, that's currently being
allocated to your PHP script.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>real_usage</parameter></term>
<listitem>
<para>
Set this to &true; to get the real size of memory allocated from
system. If not set or &false; only the memory used by
<literal>emalloc()</literal> is reported.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the memory amount in bytes.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.2.1</entry>
<entry>
Compiling with <link linkend="ini.memory-limit">--enable-memory-limit</link>
is no longer required for this function to exist.
</entry>
</row>
<row>
<entry>5.2.0</entry>
<entry>
<parameter>real_usage</parameter> was added.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>A <function>memory_get_usage</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// This is only an example, the numbers below will
// differ depending on your system
echo memory_get_usage() . "\n"; // 36640
$a = str_repeat("Hello", 4242);
echo memory_get_usage() . "\n"; // 57960
unset($a);
echo memory_get_usage() . "\n"; // 36744
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>memory_get_peak_usage</function></member>
<member><link linkend="ini.memory-limit">memory_limit</link></member>
</simplelist>
</para>
</refsect1>
</refentry>
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