📄 function.session-id.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>Get and/or set the current session id</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-get-cookie-params.html">session_get_cookie_params</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-is-registered.html">session_is_registered</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-id" class="refentry"> <div class="refnamediv"> <h1 class="refname">session_id</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">session_id</span> — <span class="dc-title">Get and/or set the current session id</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>session_id</b></b></span> ([ <span class="methodparam"><span class="type">string</span> <tt class="parameter">$id</tt></span> ] )</div> <p class="para rdfs-comment"> <b>session_id()</b> is used to get or set the session id for the current session. </p> <p class="para"> The constant <code class="systemitem systemitem">SID</code> can also be used to retrieve the current name and session id as a string suitable for adding to URLs. See also <a href="ref.session.html" class="link">Session handling</a>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">id</tt></i></span> <dd> <p class="para"> If <i><tt class="parameter">id</tt></i> is specified, it will replace the current session id. <b>session_id()</b> needs to be called before <a href="function.session-start.html" class="function">session_start()</a> for that purpose. Depending on the session handler, not all characters are allowed within the session id. For example, the file session handler only allows characters in the range <i>a-z, A-Z and 0-9</i>! </p> <blockquote><p><b class="note">Note</b>: <span class="simpara"> When using session cookies, specifying an <i><tt class="parameter">id</tt></i> for <b>session_id()</b> will always send a new cookie when <a href="function.session-start.html" class="function">session_start()</a> is called, regardless if the current session id is identical to the one being set. </span> </p></blockquote> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>session_id()</b> returns the session id for the current session or the empty string (<i>""</i>) if there is no current session (no current session id exists). </p> </div><div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.session-regenerate-id.html" class="function" rel="rdfs-seeAlso">session_regenerate_id()</a></li> <li class="member"><a href="function.session-start.html" class="function" rel="rdfs-seeAlso">session_start()</a></li> <li class="member"><a href="function.session-set-save-handler.html" class="function" rel="rdfs-seeAlso">session_set_save_handler()</a></li> <li class="member"> <a href="session.configuration.html#ini.session.save-handler" class="link">session.save_handler</a> </li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.session-get-cookie-params.html">session_get_cookie_params</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.session-is-registered.html">session_is_registered</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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