<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Introduction</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.memtrack.html">Memtrack</a></div> <div class="next" style="text-align: right; float: right;"><a href="memtrack.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.memtrack.html">Memtrack</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="intro.memtrack" class="preface"> <h1 class="title">Introduction</h1> <p class="para"> The purpose of this extension is to detect the most memory hungry scripts and functions. </p> <p class="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. </p> <p class="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. </p> <p class="para"> memtrack doesn't provide any functions, there are only INI directives which allow you to configure the way it should work. </p> <div class="warning"><strong class="warning">Warning</strong><p class="simpara">This extension is <em class="emphasis">EXPERIMENTAL</em>. The behaviour of this extension including the names of its functions and any other documentation surrounding this extension may change without notice in a future release of PHP. This extension should be used at your own risk.</p></div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.memtrack.html">Memtrack</a></div> <div class="next" style="text-align: right; float: right;"><a href="memtrack.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.memtrack.html">Memtrack</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>
