📄 function.socket-last-error.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>Returns the last error on 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-getsockname.html">socket_getsockname</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.socket-listen.html">socket_listen</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-last-error" class="refentry"> <div class="refnamediv"> <h1 class="refname">socket_last_error</h1> <p class="verinfo">(PHP 4 >= 4.0.7, PHP 5)</p><p class="refpurpose"><span class="refname">socket_last_error</span> — <span class="dc-title">Returns the last error on the socket </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>socket_last_error</b></b></span> ([ <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$socket</tt></span> ] )</div> <p class="para rdfs-comment"> If a socket resource is passed to this function, the last error which occurred on this particular socket is returned. If the socket resource is omitted, the error code of the last failed socket function is returned. The latter is particularly helpful for functions like <a href="function.socket-create.html" class="function">socket_create()</a> which don't return a socket on failure and <a href="function.socket-select.html" class="function">socket_select()</a> which can fail for reasons not directly tied to a particular socket. The error code is suitable to be fed to <a href="function.socket-strerror.html" class="function">socket_strerror()</a> which returns a string describing the given error code. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">socket</tt></i></span> <dd> <p class="para"> A valid socket resource created with <a href="function.socket-create.html" class="function">socket_create()</a>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> This function returns a socket error code. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>socket_last_error()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$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">$socket </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$errorcode </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">();<br /> </span><span style="color: #0000BB">$errormsg </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">$errorcode</span><span style="color: #007700">);<br /> <br /> die(</span><span style="color: #DD0000">"Couldn't create socket: [$errorcode] $errormsg"</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <b>socket_last_error()</b> does not clear the error code, use <a href="function.socket-clear-error.html" class="function">socket_clear_error()</a> for this purpose. <br /> </p></blockquote> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.socket-getsockname.html">socket_getsockname</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.socket-listen.html">socket_listen</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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