📄 function.session-unset.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>Free all session variables</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-unregister.html">session_unregister</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-write-close.html">session_write_close</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-unset" class="refentry"> <div class="refnamediv"> <h1 class="refname">session_unset</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">session_unset</span> — <span class="dc-title">Free all session variables</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type"><span class="type void">void</span></span> <span class="methodname"><b><b>session_unset</b></b></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> The <b>session_unset()</b> function frees all session variables currently registered. </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> No value is returned. </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.unset.html" class="function">unset()</a> to unregister a session variable, i.e. <i>unset ($_SESSION['varname']);</i>. <br /> </p></blockquote> <div class="caution"><b class="caution">Caution</b> <p class="para"> Do NOT unset the whole <var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var> with <i>unset($_SESSION)</i> as this will disable the registering of session variables through the <var class="varname"><a href="reserved.variables.session.html" class="classname">$_SESSION</a></var> superglobal. </p> </div> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-unregister.html">session_unregister</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-write-close.html">session_write_close</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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