php-doc-en/reference/info/functions/memory-get-peak-usage.xml

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<refentry id="function.memory-get-peak-usage">
 <refnamediv>
  <refname>memory_get_peak_usage</refname>
  <refpurpose>Returns the peak of memory allocated by PHP</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>memory_get_peak_usage</methodname>
   <methodparam choice="opt"><type>bool</type><parameter>real_usage</parameter></methodparam>
  </methodsynopsis>
  <para>
   Returns the peak of memory, in bytes, that's been allocated to your PHP
   script.
  </para>
  <para>
   <function>memory_get_peak_usage</function> will only be defined if your PHP
   is compiled with the <literal>--enable-memory-limit</literal> 
   configuration option.
  </para>
  <para>
   <parameter>real_usage</parameter> was added as of PHP 5.2.0.
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>memory_get_usage</function></member>
    <member><link linkend="ini.memory-limit">memory_limit</link></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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