php-doc-en/reference/memtrack/book.xml

<?xml version="1.0" encoding="utf-8"?>
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<book xml:id="book.memtrack" xmlns="http://docbook.org/ns/docbook">
 <title>Memtrack</title>
 <titleabbrev>Memtrack</titleabbrev>

 <preface xml:id="intro.memtrack">
  &reftitle.intro;
  <para>
   The purpose of this extension is to detect the most memory hungry scripts
   and functions.
  </para>
  <para>
   memtrack tracks memory consumption in PHP scripts and produces reports 
   (warnings) when the consumption reaches certain levels set by the user.
   This is achieved by replacing default executor function by a special 
   function which compares memory usage before and after running the 
   original executor - this way we can tell how much the memory usage 
   has changed during the execution of the current part of the code.
  </para>
  <para>
   Zend Engine runs its executor for each opcode array (op_array), 
   which usually means function, plain script and such, so memtrack doesn't
   have any noticeable effect on performance.
  </para>
  <para>
   memtrack doesn't provide any functions, there are only INI directives which
   allow you to configure the way it should work.
  </para>
  &warn.experimental;
 </preface>

 &reference.memtrack.setup;
 &reference.memtrack.constants;
 &reference.memtrack.examples;

</book>

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