function.session-is-registered.html
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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>Find out whether a global variable is registered in a session</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="function.session-id.html">session_id</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-module-name.html">session_module_name</a></div> <div class="up"><a href="ref.session.html">Session Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.session-is-registered" class="refentry"> <div class="refnamediv"> <h1 class="refname">session_is_registered</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">session_is_registered</span> — <span class="dc-title">Find out whether a global variable is registered in a session</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>session_is_registered</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$name</tt></span> )</div> <p class="para rdfs-comment"> Finds out whether a global variable is registered in a session. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">name</tt></i></span> <dd> <p class="para"> The variable name. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>session_is_registered()</b> returns <b><tt>TRUE</tt></b> if there is a global variable with the name <i><tt class="parameter">name</tt></i> registered in the current session, <b><tt>FALSE</tt></b> otherwise. </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: If <var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var> (or <var class="varname">$HTTP_SESSION_VARS</var> for PHP 4.0.6 or less) is used, use <a href="function.isset.html" class="function">isset()</a> to check a variable is registered in <var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var>. <br /> </p></blockquote> <div class="caution"><b class="caution">Caution</b> <p class="para"> If you are using <var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var> (or <var class="varname">$HTTP_SESSION_VARS</var>), do not use <a href="function.session-register.html" class="function">session_register()</a>, <b>session_is_registered()</b> and <a href="function.session-unregister.html" class="function">session_unregister()</a>. </p> </div> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-id.html">session_id</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-module-name.html">session_module_name</a></div> <div class="up"><a href="ref.session.html">Session Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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