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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>Open Internet or Unix domain socket connection</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-accept.html">stream_socket_accept</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-enable-crypto.html">stream_socket_enable_crypto</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-client" class="refentry"> <div class="refnamediv"> <h1 class="refname">stream_socket_client</h1> <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">stream_socket_client</span> — <span class="dc-title">Open Internet or Unix domain socket connection</span></p> </div> <div class="refsect1 unknown"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>stream_socket_client</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$remote_socket</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter reference">&$errno</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter reference">&$errstr</tt></span> [, <span class="methodparam"><span class="type">float</span> <tt class="parameter">$timeout</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$flags</tt></span> [, <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$context</tt></span> ]]]]] )</div> <p class="para rdfs-comment"> Initiates a stream or datagram connection to the destination specified by <i><tt class="parameter">remote_socket</tt></i>. The type of socket created is determined by the transport specified using standard URL formatting: <i>transport://target</i>. For Internet Domain sockets (AF_INET) such as TCP and UDP, the <i>target</i> portion of the <i><tt class="parameter">remote_socket</tt></i> parameter should consist of a hostname or IP address followed by a colon and a port number. For Unix domain sockets, the <i><tt class="parameter">target</tt></i> portion should point to the socket file on the filesystem. The optional <i><tt class="parameter">timeout</tt></i> can be used to set a timeout in seconds for the connect system call. <i><tt class="parameter">flags</tt></i> is a bitmask field which may be set to any combination of connection flags. Currently the selection of connection flags is limited to <b><tt>STREAM_CLIENT_CONNECT</tt></b> (default), <b><tt>STREAM_CLIENT_ASYNC_CONNECT</tt></b> and <b><tt>STREAM_CLIENT_PERSISTENT</tt></b>. </p> <blockquote><p><b class="note">Note</b>: <span class="simpara"> If you need to set a timeout for reading/writing data over the socket, use <a href="function.stream-set-timeout.html" class="function">stream_set_timeout()</a>, as the <i><tt class="parameter">timeout</tt></i> parameter to <b>stream_socket_client()</b> only applies while connecting the socket. </span> </p></blockquote> <blockquote><p><b class="note">Note</b>: <span class="simpara"> The timeout parameter only applies if you are not making an asynchronous connection attempt. </span> </p></blockquote> <p class="para"> <b>stream_socket_client()</b> returns a stream resource which may be used together with the other file functions (such as <a href="function.fgets.html" class="function">fgets()</a>, <a href="function.fgetss.html" class="function">fgetss()</a>, <a href="function.fwrite.html" class="function">fwrite()</a>, <a href="function.fclose.html" class="function">fclose()</a>, and <a href="function.feof.html" class="function">feof()</a>). </p> <p class="para"> If the call fails, it will return <b><tt>FALSE</tt></b> and if the optional <i><tt class="parameter">errno</tt></i> and <i><tt class="parameter">errstr</tt></i> arguments are present they will be set to indicate the actual system level error that occurred in the system-level <i>connect()</i> call. If the value returned in <i><tt class="parameter">errno</tt></i> is <i>0</i> and the function returned <b><tt>FALSE</tt></b>, it is an indication that the error occurred before the <i>connect()</i> call. This is most likely due to a problem initializing the socket. Note that the <i><tt class="parameter">errno</tt></i> and <i><tt class="parameter">errstr</tt></i> arguments will always be passed by reference. </p> <p class="para"> Depending on the environment, the Unix domain or the optional connect timeout may not be available. A list of available transports can be retrieved using <a href="function.stream-get-transports.html" class="function">stream_get_transports()</a>. See <a href="transports.html" class="xref">List of Supported Socket Transports</a> for a list of built in transports. </p> <p class="para"> The stream will by default be opened in blocking mode. You can switch it to non-blocking mode by using <a href="function.stream-set-blocking.html" class="function">stream_set_blocking()</a>. <div class="example"> <p><b>Example #1 <b>stream_socket_client()</b> Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_socket_client</span><span style="color: #007700">(</span><span style="color: #DD0000">"tcp://www.example.com:80"</span><span style="color: #007700">, </span><span style="color: #0000BB">$errno</span><span style="color: #007700">, </span><span style="color: #0000BB">$errstr</span><span style="color: #007700">, </span><span style="color: #0000BB">30</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$fp</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"$errstr ($errno)<br />\n"</span><span style="color: #007700">;<br />} else {<br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n"</span><span style="color: #007700">);<br /> while (!</span><span style="color: #0000BB">feof</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">fgets</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">1024</span><span style="color: #007700">);<br /> }<br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> The example below shows how to retrieve the day and time from the UDP service "daytime" (port 13) in your own machine. <div class="example"> <p><b>Example #2 Using UDP connection</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_socket_client</span><span style="color: #007700">(</span><span style="color: #DD0000">"udp://127.0.0.1:13"</span><span style="color: #007700">, </span><span style="color: #0000BB">$errno</span><span style="color: #007700">, </span><span style="color: #0000BB">$errstr</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$fp</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"ERROR: $errno - $errstr<br />\n"</span><span style="color: #007700">;<br />} else {<br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">);<br /> echo </span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">26</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <div class="warning"><b class="warning">Warning</b> <p class="simpara"> UDP sockets will sometimes appear to have opened without an error, even if the remote host is unreachable. The error will only become apparent when you read or write data to/from the socket. The reason for this is because UDP is a "connectionless" protocol, which means that the operating system does not try to establish a link for the socket until it actually needs to send or receive data. </p> </div> </p> <blockquote><p><b class="note">Note</b>: <span class="simpara">When specifying a numerical IPv6 address(e.g. <i>fe80::1</i>), you must enclose the IP in squarebrackets鈥攆or example, <i>tcp://[fe80::1]:80</i>.</span></p></blockquote> <p class="para"> See also <a href="function.stream-socket-server.html" class="function">stream_socket_server()</a>, <a href="function.stream-set-blocking.html" class="function">stream_set_blocking()</a>, <a href="function.stream-set-timeout.html" class="function">stream_set_timeout()</a>, <a href="function.stream-select.html" class="function">stream_select()</a>, <a href="function.fgets.html" class="function">fgets()</a>, <a href="function.fgetss.html" class="function">fgetss()</a>, <a href="function.fwrite.html" class="function">fwrite()</a>, <a href="function.fclose.html" class="function">fclose()</a>, <a href="function.feof.html" class="function">feof()</a>, and the <a href="ref.curl.html" class="link">Curl extension</a>. </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.stream-socket-accept.html">stream_socket_accept</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.stream-socket-enable-crypto.html">stream_socket_enable_crypto</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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