📄 function.socket-listen.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>Listens for a connection on a socket</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.socket-last-error.html">socket_last_error</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.socket-read.html">socket_read</a></div> <div class="up"><a href="ref.sockets.html">Socket Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.socket-listen" class="refentry"> <div class="refnamediv"> <h1 class="refname">socket_listen</h1> <p class="verinfo">(PHP 4 >= 4.0.7, PHP 5)</p><p class="refpurpose"><span class="refname">socket_listen</span> — <span class="dc-title">Listens for a connection on a socket</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>socket_listen</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$socket</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$backlog</tt></span> ] )</div> <p class="para rdfs-comment"> After the socket <i><tt class="parameter">socket</tt></i> has been created using <a href="function.socket-create.html" class="function">socket_create()</a> and bound to a name with <a href="function.socket-bind.html" class="function">socket_bind()</a>, it may be told to listen for incoming connections on <i><tt class="parameter">socket</tt></i>. </p> <p class="para"> <b>socket_listen()</b> is applicable only to sockets of type <b><tt>SOCK_STREAM</tt></b> or <b><tt>SOCK_SEQPACKET</tt></b>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">socket</tt></i></span> <dd> <p class="para"> A valid socket resource created with <a href="function.socket-create.html" class="function">socket_create()</a>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">backlog</tt></i></span> <dd> <p class="para"> A maximum of <i><tt class="parameter">backlog</tt></i> incoming connections will be queued for processing. If a connection request arrives with the queue full the client may receive an error with an indication of <i>ECONNREFUSED</i>, or, if the underlying protocol supports retransmission, the request may be ignored so that retries may succeed. </p> <blockquote><p><b class="note">Note</b>: The maximum number passed to the <i><tt class="parameter">backlog</tt></i> parameter highly depends on the underlying platform. On Linux, it is silently truncated to <b><tt>SOMAXCONN</tt></b>. On win32, if passed <b><tt>SOMAXCONN</tt></b>, the underlying service provider responsible for the socket will set the backlog to a maximum <em class="emphasis">reasonable</em> value. There is no standard provision to find out the actual backlog value on this platform. <br /> </p></blockquote> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. The error code can be retrieved with <a href="function.socket-last-error.html" class="function">socket_last_error()</a>. This code may be passed to <a href="function.socket-strerror.html" class="function">socket_strerror()</a> to get a textual explanation of the error. </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.socket-accept.html" class="function" rel="rdfs-seeAlso">socket_accept()</a></li> <li class="member"><a href="function.socket-bind.html" class="function" rel="rdfs-seeAlso">socket_bind()</a></li> <li class="member"><a href="function.socket-connect.html" class="function" rel="rdfs-seeAlso">socket_connect()</a></li> <li class="member"><a href="function.socket-create.html" class="function" rel="rdfs-seeAlso">socket_create()</a></li> <li class="member"><a href="function.socket-strerror.html" class="function" rel="rdfs-seeAlso">socket_strerror()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.socket-last-error.html">socket_last_error</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.socket-read.html">socket_read</a></div> <div class="up"><a href="ref.sockets.html">Socket 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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