📄 function.socket-set-option.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>Sets socket options for the 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-set-nonblock.html">socket_set_nonblock</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.socket-shutdown.html">socket_shutdown</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-set-option" class="refentry"> <div class="refnamediv"> <h1 class="refname">socket_set_option</h1> <p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">socket_set_option</span> — <span class="dc-title">Sets socket options for the 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_set_option</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$socket</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$level</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$optname</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$optval</tt></span> )</div> <p class="para rdfs-comment"> The <b>socket_set_option()</b> function sets the option specified by the <i><tt class="parameter">optname</tt></i> parameter, at the specified protocol <i><tt class="parameter">level</tt></i>, to the value pointed to by the <i><tt class="parameter">optval</tt></i> parameter for the <i><tt class="parameter">socket</tt></i>. </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> or <a href="function.socket-accept.html" class="function">socket_accept()</a>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">level</tt></i></span> <dd> <p class="para"> The <i><tt class="parameter">level</tt></i> parameter specifies the protocol level at which the option resides. For example, to retrieve options at the socket level, a <i><tt class="parameter">level</tt></i> parameter of <b><tt>SOL_SOCKET</tt></b> would be used. Other levels, such as TCP, can be used by specifying the protocol number of that level. Protocol numbers can be found by using the <a href="function.getprotobyname.html" class="function">getprotobyname()</a> function. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">optname</tt></i></span> <dd> <p class="para"> The available socket options are the same as those for the <a href="function.socket-get-option.html" class="function">socket_get_option()</a> function. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">optval</tt></i></span> <dd> <p class="para"> The option value. </p> </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. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>socket_set_option()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$socket </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_create</span><span style="color: #007700">(</span><span style="color: #0000BB">AF_INET</span><span style="color: #007700">, </span><span style="color: #0000BB">SOCK_STREAM</span><span style="color: #007700">, </span><span style="color: #0000BB">SOL_TCP</span><span style="color: #007700">);<br /><br />if (!</span><span style="color: #0000BB">is_resource</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'Unable to create socket: '</span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">()) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /><br />if (!</span><span style="color: #0000BB">socket_set_option</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">SOL_SOCKET</span><span style="color: #007700">, </span><span style="color: #0000BB">SO_REUSEADDR</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'Unable to set option on socket: '</span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">()) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /><br />if (!</span><span style="color: #0000BB">socket_bind</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #DD0000">'127.0.0.1'</span><span style="color: #007700">, </span><span style="color: #0000BB">1223</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'Unable to bind socket: '</span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">()) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$rval </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_get_option</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">SOL_SOCKET</span><span style="color: #007700">, </span><span style="color: #0000BB">SO_REUSEADDR</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">$rval </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Unable to get socket option: '</span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">()) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />} else if (</span><span style="color: #0000BB">$rval </span><span style="color: #007700">!== </span><span style="color: #0000BB">0</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'SO_REUSEADDR is set on socket !' </span><span style="color: #007700">. </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.3.0</td> <td colspan="1" rowspan="1" align="left"> This function was renamed. It used to be called <b>socket_setopt()</b>. </td> </tr> </tbody> </colgroup> </table> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.socket-set-nonblock.html">socket_set_nonblock</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.socket-shutdown.html">socket_shutdown</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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