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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>PHP Manual</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href=""></a></div> <div class="next" style="text-align: right; float: right;"><a href=""></a></div> <div class="up"><a href=""></a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1 class="title">PHP Manual</h1>  <div class="info" id="bookinfo" name="bookinfo">  <div class="authorgroup" id="authors" name="authors">   <div class="author vcard"><b class="by">by</b>:<br />   <span class="personname fn">     <span class="firstname given-name">Mehdi</span>  <span class="surname family-name">Achour</span>     </span>   </div>      <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Friedhelm</span>  <span class="surname family-name">Betz</span>     </span>   </div>   <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Antony</span>  <span class="surname family-name">Dovgal</span>     </span>   </div>      <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Nuno</span>  <span class="surname family-name">Lopes</span>     </span>   </div>   <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Hannes</span>  <span class="surname family-name">Magnusson</span>     </span>   </div>   <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Georg</span>  <span class="surname family-name">Richter</span>     </span>   </div>   <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Damien</span>  <span class="surname family-name">Seguy</span>     </span>   </div>   <div class="author vcard">   <span class="personname fn">     <span class="firstname given-name">Jakub</span>  <span class="surname family-name">Vrana</span>     </span>   </div>      <div class="othercredit">    <span class="personname fn">      <span class="othername">     <a href="preface.html#contributors" class="link">And several others</a>     </span>     </span>   </div>  </div>  <div class="pubdate">2008-10-10</div>    <div class="authorgroup" id="editors" name="editors">   <div class="editor vcard"><b class="editedby">Edited By</b>:    <span class="personname fn">     <span class="firstname given-name">Philip</span>  <span class="surname family-name">Olson</span>     </span>   </div>  </div>  <div class="copyright">&copy;    <span class="year">1997-2008</span>   <span class="holder">the PHP Documentation Group</span>  </div>   </div>              <ul class="chunklist chunklist_set"><li><a href="copyright.html">Copyright</a></li><li><a href="manual.html">PHP Manual</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="preface.html">Preface</a></li></ul></li><li><a href="getting-started.html">Getting Started</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="introduction.html">Introduction</a></li><li><a href="tutorial.html">A simple tutorial</a></li></ul></li><li><a href="install.html">Installation and Configuration</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="install.general.html">General Installation Considerations</a></li><li><a href="install.unix.html">Installation on Unix systems</a></li><li><a href="install.macosx.html">Installation on Mac OS X</a></li><li><a href="install.windows.html">Installation on Windows systems</a></li><li><a href="install.pecl.html">Installation of PECL extensions</a></li><li><a href="install.problems.html">Problems?</a></li><li><a href="configuration.html">Runtime Configuration</a></li></ul></li><li><a href="langref.html">Language Reference</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="language.basic-syntax.html">Basic syntax</a></li><li><a href="language.types.html">Types</a></li><li><a href="language.variables.html">Variables</a></li><li><a href="language.constants.html">Constants</a></li><li><a href="language.expressions.html">Expressions</a></li><li><a href="language.operators.html">Operators</a></li><li><a href="language.control-structures.html">Control Structures</a></li><li><a href="language.functions.html">Functions</a></li><li><a href="language.oop.html">Classes and Objects (PHP 4)</a></li><li><a href="language.oop5.html">Classes and Objects (PHP 5)</a></li><li><a href="language.namespaces.html">Namespaces</a></li><li><a href="language.exceptions.html">Exceptions</a></li><li><a href="language.references.html">References Explained</a></li><li><a href="reserved.variables.html">Predefined variables</a></li><li><a href="reserved.exceptions.html">Predefined Exceptions</a></li><li><a href="context.html">Context options and parameters</a></li></ul></li><li><a href="security.html">Security</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="security.intro.html">Introduction</a></li><li><a href="security.general.html">General considerations</a></li><li><a href="security.cgi-bin.html">Installed as CGI binary</a></li><li><a href="security.apache.html">Installed as an Apache module</a></li><li><a href="security.filesystem.html">Filesystem Security</a></li><li><a href="security.database.html">Database Security</a></li><li><a href="security.errors.html">Error Reporting</a></li><li><a href="security.globals.html">Using Register Globals</a></li><li><a href="security.variables.html">User Submitted Data</a></li><li><a href="security.magicquotes.html">Magic Quotes</a></li><li><a href="security.hiding.html">Hiding PHP</a></li><li><a href="security.current.html">Keeping Current</a></li></ul></li><li><a href="features.html">Features</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="features.http-auth.html">HTTP authentication with PHP</a></li><li><a href="features.cookies.html">Cookies</a></li><li><a href="features.sessions.html">Sessions</a></li><li><a href="features.xforms.html">Dealing with XForms</a></li><li><a href="features.file-upload.html">Handling file uploads</a></li><li><a href="features.remote-files.html">Using remote files</a></li><li><a href="features.connection-handling.html">Connection handling</a></li><li><a href="features.persistent-connections.html">Persistent Database Connections</a></li><li><a href="features.safe-mode.html">Safe Mode</a></li><li><a href="features.commandline.html">Using PHP from the command line</a></li></ul></li><li><a href="funcref.html">Function Reference</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="refs.basic.php.html">Affecting PHP's Behaviour</a></li><li><a href="refs.utilspec.audio.html">Audio Formats Manipulation</a></li><li><a href="refs.remote.auth.html">Authentication Services</a></li><li><a href="refs.calendar.html">Calendar and Event Related Extensions</a></li><li><a href="refs.utilspec.cmdline.html">Command Line Specific Extensions</a></li><li><a href="refs.compression.html">Compression and Archive Extensions</a></li><li><a href="refs.creditcard.html">Credit Card Processing</a></li><li><a href="refs.crypto.html">Cryptography Extensions</a></li><li><a href="refs.database.html">Database Extensions</a></li><li><a href="refs.fileprocess.file.html">File System Related Extensions</a></li><li><a href="refs.international.html">Human Language and Character Encoding Support</a></li><li><a href="refs.utilspec.image.html">Image Processing and Generation</a></li><li><a href="refs.remote.mail.html">Mail Related Extensions</a></li><li><a href="refs.math.html">Mathematical Extensions</a></li><li><a href="refs.utilspec.nontext.html">Non-Text MIME Output</a></li><li><a href="refs.fileprocess.process.html">Process Control Extensions</a></li><li><a href="refs.basic.other.html">Other Basic Extensions</a></li><li><a href="refs.remote.other.html">Other Services</a></li><li><a href="refs.search.html">Search Engine Extensions</a></li><li><a href="refs.utilspec.server.html">Server Specific Extensions</a></li><li><a href="refs.basic.session.html">Session Extensions</a></li><li><a href="refs.basic.text.html">Text Processing</a></li><li><a href="refs.basic.vartype.html">Variable and Type Related Extensions</a></li><li><a href="refs.webservice.html">Web Services</a></li><li><a href="refs.utilspec.windows.html">Windows Only Extensions</a></li><li><a href="refs.xml.html">XML Manipulation</a></li></ul></li><li><a href="internals2.html">PHP at the Core: A Hacker's Guide to the Zend Engine</a><ul class="chunklist chunklist_set chunklist_children"><li><a href="internals2.preface.html">Preface</a></li><li><a href="internals2.counter.html">The "counter" Extension - A Continuing Example</a></li><li><a href="internals2.buildsys.html">The PHP 5 build system</a></li><li><a href="internals2.structure.html">Extension structure</a></li><li><a href="internals2.memory.html">Memory management</a></li><li><a href="internals2.variables.html">Working with variables</a></li><li><a href="internals2.funcs.html">Writing functions</a></li><li><a href="internals2.objects.html">Working with classes and objects</a></li><li><a href="internals2.resources.html">Working with resources</a></li><li><a href="internals2.ini.html">Working with INI settings</a></li><li><a href="internals2.streams.html">Working with streams</a></li><li><a href="internals2.pdo.html">PDO Driver How-To</a></li><li><a href="internals2.faq.html">Extension FAQs</a></li><li><a href="internals2.apiref.html">Zend Engine 2 API reference</a></li><li><a href="internals2.ze1.html">Zend Engine 1</a></li><li><a href="internals2.ze3.html">The future: PHP 6 and Zend Engine 3</a></li></ul></li><li><a href="faq.html">FAQ</a> 鈥
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