function.stream-socket-recvfrom.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>Receives data from a socket, connected or not</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-pair.html">stream_socket_pair</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-sendto.html">stream_socket_sendto</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-recvfrom" class="refentry"> <div class="refnamediv"> <h1 class="refname">stream_socket_recvfrom</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">stream_socket_recvfrom</span> — <span class="dc-title">Receives data from a socket, connected or not </span></p> </div> <div class="refsect1 unknown"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>stream_socket_recvfrom</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$socket</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$length</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$flags</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter reference">&$address</tt></span> ]] )</div> <p class="para rdfs-comment"> The function <b>stream_socket_recvfrom()</b> accepts data from a remote socket up to <i><tt class="parameter">length</tt></i> bytes. If <i><tt class="parameter">address</tt></i> is provided it will be populated with the address of the remote socket. </p> <p class="para"> The value of <i><tt class="parameter">flags</tt></i> can be any combination of the following: <table border="5"> <caption><b>possible values for <i><tt class="parameter">flags</tt></i></b></caption> <colgroup> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>STREAM_OOB</tt></b></td> <td colspan="1" rowspan="1" align="left"> Process OOB (out-of-band) data. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>STREAM_PEEK</tt></b></td> <td colspan="1" rowspan="1" align="left"> Retrieve data from the socket, but do not consume the buffer. Subsequent calls to <a href="function.fread.html" class="function">fread()</a> or <b>stream_socket_recvfrom()</b> will see the same data. </td> </tr> </tbody> </colgroup> </table> </p> <div class="example"> <p><b>Example #1 <b>stream_socket_recvfrom()</b> Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">/* Open a server socket to port 1234 on localhost */<br /></span><span style="color: #0000BB">$server </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_socket_server</span><span style="color: #007700">(</span><span style="color: #DD0000">'tcp://127.0.0.1:1234'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Accept a connection */<br /></span><span style="color: #0000BB">$socket </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_socket_accept</span><span style="color: #007700">(</span><span style="color: #0000BB">$server</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Grab a packet (1500 is a typical MTU size) of OOB data */<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"Received Out-Of-Band: '" </span><span style="color: #007700">. </span><span style="color: #0000BB">stream_socket_recvfrom</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">1500</span><span style="color: #007700">, </span><span style="color: #0000BB">STREAM_OOB</span><span style="color: #007700">) . </span><span style="color: #DD0000">"'\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Take a peek at the normal in-band data, but don't comsume it. */<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"Data: '" </span><span style="color: #007700">. </span><span style="color: #0000BB">stream_socket_recvfrom</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">1500</span><span style="color: #007700">, </span><span style="color: #0000BB">STREAM_PEEK</span><span style="color: #007700">) . </span><span style="color: #DD0000">"'\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Get the exact same packet again, but remove it from the buffer this time. */<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"Data: '" </span><span style="color: #007700">. </span><span style="color: #0000BB">stream_socket_recvfrom</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">1500</span><span style="color: #007700">) . </span><span style="color: #DD0000">"'\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Close it up */<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$server</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <blockquote><p><b class="note">Note</b>: If a message received is longer than the <i><tt class="parameter">length</tt></i> parameter, excess bytes may be discarded depending on the type of socket the message is received from (such as UDP). <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: Calls to <b>stream_socket_recvfrom()</b> on socket-based streams, after calls to buffer-based stream functions (like <a href="function.fread.html" class="function">fread()</a> or <a href="function.stream-get-line.html" class="function">stream_get_line()</a>) read data directly from the socket and bypass the stream buffer. <br /> </p></blockquote> <p class="para"> See also <a href="function.stream-socket-sendto.html" class="function">stream_socket_sendto()</a>, <a href="function.stream-socket-client.html" class="function">stream_socket_client()</a>, and <a href="function.stream-socket-server.html" class="function">stream_socket_server()</a>. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.stream-socket-pair.html">stream_socket_pair</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-sendto.html">stream_socket_sendto</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></body></html>⌨️ 快捷键说明
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