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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.dns-get-record.html">dns_get_record</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.gethostbyaddr.html">gethostbyaddr</a></div> <div class="up"><a href="ref.network.html">Network Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.fsockopen" class="refentry"> <div class="refnamediv"> <h1 class="refname">fsockopen</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">fsockopen</span> — <span class="dc-title">Open Internet or Unix domain socket connection</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>fsockopen</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$hostname</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$port</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> ]]]] )</div> <p class="para rdfs-comment"> Initiates a socket connection to the resource specified by <i><tt class="parameter">hostname</tt></i>. </p> <p class="para"> PHP supports targets in the Internet and Unix domains as described in <a href="transports.html" class="xref">List of Supported Socket Transports</a>. A list of supported transports can also be retrieved using <a href="function.stream-get-transports.html" class="function">stream_get_transports()</a>. </p> <p class="para"> The socket 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>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">hostname</tt></i></span> <dd> <p class="para"> If you have compiled in OpenSSL support, you may prefix the <i><tt class="parameter">hostname</tt></i> with either <i>ssl://</i> or <i>tls://</i> to use an SSL or TLS client connection over TCP/IP to connect to the remote host. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">port</tt></i></span> <dd> <p class="para"> The port number. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">errno</tt></i></span> <dd> <p class="para"> If provided, holds the system level error number that occurred in the system-level <i>connect()</i> call. </p> <p class="para"> 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. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">errstr</tt></i></span> <dd> <p class="para"> The error message as a string. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">timeout</tt></i></span> <dd> <p class="para"> The connection timeout, in seconds. </p> <blockquote><p><b class="note">Note</b>: 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>fsockopen()</b> only applies while connecting the socket. <br /> </p></blockquote> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>fsockopen()</b> returns a file pointer 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>). If the call fails, it will return <b><tt>FALSE</tt></b> </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"> Added support for the <i><tt class="parameter">timeout</tt></i> parameter on win32. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.3.0</td> <td colspan="1" rowspan="1" align="left"> SSL and TLS over TCP/IP support was added. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.0</td> <td colspan="1" rowspan="1" align="left"> UDP support was added. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3.0.9</td> <td colspan="1" rowspan="1" align="left"> The <i><tt class="parameter">timeout</tt></i> parameter was added. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>fsockopen()</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">fsockopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"www.example.com"</span><span style="color: #007700">, </span><span style="color: #0000BB">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 ($errno)<br />\n"</span><span style="color: #007700">;<br />} else {<br /> </span><span style="color: #0000BB">$out </span><span style="color: #007700">= </span><span style="color: #DD0000">"GET / HTTP/1.1\r\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$out </span><span style="color: #007700">.= </span><span style="color: #DD0000">"Host: www.example.com\r\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$out </span><span style="color: #007700">.= </span><span style="color: #DD0000">"Connection: Close\r\n\r\n"</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #0000BB">$out</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">128</span><span style="color: #007700">);<br /> }<br /> </span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 Using UDP connection</b></p> <div class="example-contents"><p> The example below shows how to retrieve the day and time from the UDP service "daytime" (port 13) in your own machine. </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fsockopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"udp://127.0.0.1"</span><span style="color: #007700">, </span><span style="color: #0000BB">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> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Depending on the environment, the Unix domain or the optional connect timeout may not be available. <br /> </p></blockquote> <div class="warning"><b class="warning">Warning</b> <p class="para"> 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> <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> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.pfsockopen.html" class="function" rel="rdfs-seeAlso">pfsockopen()</a></li> <li class="member"><a href="function.stream-set-blocking.html" class="function" rel="rdfs-seeAlso">stream_set_blocking()</a></li> <li class="member"><a href="function.stream-set-timeout.html" class="function" rel="rdfs-seeAlso">stream_set_timeout()</a></li> <li class="member"><a href="function.fgets.html" class="function" rel="rdfs-seeAlso">fgets()</a></li> <li class="member"><a href="function.fgetss.html" class="function" rel="rdfs-seeAlso">fgetss()</a></li> <li class="member"><a href="function.fwrite.html" class="function" rel="rdfs-seeAlso">fwrite()</a></li> <li class="member"><a href="function.fclose.html" class="function" rel="rdfs-seeAlso">fclose()</a></li> <li class="member"><a href="function.feof.html" class="function" rel="rdfs-seeAlso">feof()</a></li> <li class="member">The <a href="ref.curl.html" class="link">Curl extension</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.dns-get-record.html">dns_get_record</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.gethostbyaddr.html">gethostbyaddr</a></div> <div class="up"><a href="ref.network.html">Network 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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