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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>Creates a pair of connected, indistinguishable socket streams</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.stream-socket-get-name.html">stream_socket_get_name</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-recvfrom.html">stream_socket_recvfrom</a></div> <div class="up"><a href="ref.stream.html">Stream Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.stream-socket-pair" class="refentry"> <div class="refnamediv"> <h1 class="refname">stream_socket_pair</h1> <p class="verinfo">(PHP 5 >= 5.1.0)</p><p class="refpurpose"><span class="refname">stream_socket_pair</span> — <span class="dc-title"> Creates a pair of connected, indistinguishable socket streams </span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>stream_socket_pair</b></b></span> ( <span class="methodparam"><span class="type">int</span> <tt class="parameter">$domain</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$type</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$protocol</tt></span> )</div> <p class="para rdfs-comment"> <b>stream_socket_pair()</b> creates a pair of connected, indistinguishable socket streams. This function is commonly used in IPC (Inter-Process Communication). </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">domain</tt></i></span> <dd> <p class="para"> The protocol family to be used: <b><tt>STREAM_PF_INET</tt></b>, <b><tt>STREAM_PF_INET6</tt></b> or <b><tt>STREAM_PF_UNIX</tt></b> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">type</tt></i></span> <dd> <p class="para"> The type of communication to be used: <b><tt>STREAM_SOCK_DGRAM</tt></b>, <b><tt>STREAM_SOCK_RAW</tt></b>, <b><tt>STREAM_SOCK_RDM</tt></b>, <b><tt>STREAM_SOCK_SEQPACKET</tt></b> or <b><tt>STREAM_SOCK_STREAM</tt></b> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">protocol</tt></i></span> <dd> <p class="para"> The protocol to be used: <b><tt>STREAM_IPPROTO_ICMP</tt></b>, <b><tt>STREAM_IPPROTO_IP</tt></b>, <b><tt>STREAM_IPPROTO_RAW</tt></b>, <b><tt>STREAM_IPPROTO_TCP</tt></b> or <b><tt>STREAM_IPPROTO_UDP</tt></b> </p> </dd> </dt> </dl> </p> <blockquote><p><b class="note">Note</b>: <span class="simpara"> Please consult the <a href="stream.constants.html" class="link">Streams constant list</a> for further details on each constant. </span> </p></blockquote> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns an <a href="language.types.array.html" class="type array">array</a> with the two socket resources 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 A <b>stream_socket_pair()</b> example</b></p> <div class="example-contents"><p> This example shows the basic usage of <b>stream_socket_pair()</b> in Inter-Process Comunication. </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />$sockets </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_socket_pair</span><span style="color: #007700">(</span><span style="color: #0000BB">STREAM_PF_UNIX</span><span style="color: #007700">, </span><span style="color: #0000BB">STREAM_SOCK_STREAM</span><span style="color: #007700">, </span><span style="color: #0000BB">STREAM_IPPROTO_IP</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$pid </span><span style="color: #007700">= </span><span style="color: #0000BB">pcntl_fork</span><span style="color: #007700">();<br /><br />if (</span><span style="color: #0000BB">$pid </span><span style="color: #007700">== -</span><span style="color: #0000BB">1</span><span style="color: #007700">) {<br /> die(</span><span style="color: #DD0000">'could not fork'</span><span style="color: #007700">);<br /><br />} else if (</span><span style="color: #0000BB">$pid</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">/* parent */<br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /><br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">], </span><span style="color: #DD0000">"child PID: $pid\n"</span><span style="color: #007700">);<br /> echo </span><span style="color: #0000BB">fgets</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /><br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /><br />} else {<br /> </span><span style="color: #FF8000">/* child */<br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /><br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">], </span><span style="color: #DD0000">"message from child\n"</span><span style="color: #007700">);<br /> echo </span><span style="color: #0000BB">fgets</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /><br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$sockets</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br />}<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="example-contents"><pre><div class="cdata"><pre>child PID: 1378message from child</pre></div> </pre></div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function is notimplemented on Windows platforms.</span></p></blockquote> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.stream-socket-get-name.html">stream_socket_get_name</a></div> <div class="next" style="text-align: right; 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