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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Open Internet or Unix domain socket connection</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.stream-socket-client" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">stream_socket_client</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">stream_socket_client</span> — <span class="dc-title">Open Internet or Unix domain socket connection</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.stream-socket-client-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>stream_socket_client</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$remote_socket</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter reference">&$errno</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$errstr</code></span>
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[, <span class="methodparam"><span class="type">float</span> <code class="parameter">$timeout</code><span class="initializer"> = ini_get("default_socket_timeout")</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code><span class="initializer"> = STREAM_CLIENT_CONNECT</span></span>
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[, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$context</code></span>
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]]]]] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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Initiates a stream or datagram connection to the destination specified
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by <code class="parameter">remote_socket</code>. The type of socket created
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is determined by the transport specified using standard URL formatting:
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<em>transport://target</em>. For Internet Domain sockets
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(AF_INET) such as TCP and UDP, the <em>target</em> portion
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of the <code class="parameter">remote_socket</code> parameter should consist of
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a hostname or IP address followed by a colon and a port number. For Unix
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domain sockets, the <code class="parameter">target</code> portion should point
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to the socket file on the filesystem.
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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The stream will by default be opened in blocking mode. You can
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switch it to non-blocking mode by using
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<span class="function"><a href="stream_set_blocking.html" class="function">stream_set_blocking()</a></span>.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.stream-socket-client-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">remote_socket</code></dt>
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<dd>
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<p class="para">
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Address to the socket to connect to.
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</p>
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</dd>
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<dt>
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<code class="parameter">errno</code></dt>
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<dd>
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<p class="para">
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Will be set to the system level error number if connection fails.
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</p>
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</dd>
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<dt>
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<code class="parameter">errstr</code></dt>
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<dd>
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<p class="para">
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Will be set to the system level error message if the connection fails.
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</p>
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</dd>
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<dt>
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<code class="parameter">timeout</code></dt>
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<dd>
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<p class="para">
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Number of seconds until the <em>connect()</em> system call
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should timeout.
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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This parameter only applies when not making asynchronous
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connection attempts.
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</span>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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To set a timeout for reading/writing data over the socket, use the
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<span class="function"><a href="stream_set_timeout.html" class="function">stream_set_timeout()</a></span>, as the
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<code class="parameter">timeout</code> only applies while making connecting
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the socket.
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</p>
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</p></blockquote>
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</p>
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</dd>
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<dt>
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<code class="parameter">flags</code></dt>
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<dd>
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<p class="para">
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Bitmask field which may be set to any combination of connection flags.
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Currently the select of connection flags is limited to
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<strong><code>STREAM_CLIENT_CONNECT</code></strong> (default),
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<strong><code>STREAM_CLIENT_ASYNC_CONNECT</code></strong> and
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<strong><code>STREAM_CLIENT_PERSISTENT</code></strong>.
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</p>
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</dd>
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<dt>
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<code class="parameter">context</code></dt>
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<dd>
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<p class="para">
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A valid context resource created with <span class="function"><a href="stream_context_create.html" class="function">stream_context_create()</a></span>.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.stream-socket-client-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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On success a stream resource is returned which may
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be used together with the other file functions (such as
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<span class="function"><a href="fgets.html" class="function">fgets()</a></span>, <span class="function"><a href="fgetss.html" class="function">fgetss()</a></span>,
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<span class="function"><a href="fwrite.html" class="function">fwrite()</a></span>, <span class="function"><a href="fclose.html" class="function">fclose()</a></span>, and
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<span class="function"><a href="feof.html" class="function">feof()</a></span>), <strong><code>FALSE</code></strong> on failure.
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.stream-socket-client-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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On failure the <code class="parameter">errno</code> and
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<code class="parameter">errstr</code> arguments will be populated with the actual
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system level error that occurred in the system-level
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<em>connect()</em> call. If the value returned in
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<code class="parameter">errno</code> is <em>0</em> and the
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function returned <strong><code>FALSE</code></strong>, it is an indication that the error
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occurred before the <em>connect()</em> call. This is
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most likely due to a problem initializing the socket. Note that
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the <code class="parameter">errno</code> and
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<code class="parameter">errstr</code> arguments will always be passed by
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reference.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.stream-socket-client-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4836">
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<p><strong>Example #1 <span class="function"><strong>stream_socket_client()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<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">"</span><span style="color: #0000BB">$errstr</span><span style="color: #DD0000"> (</span><span style="color: #0000BB">$errno</span><span style="color: #DD0000">)<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>
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</span>
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-4837">
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<p><strong>Example #2 Using UDP connection</strong></p>
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<div class="example-contents"><p>
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Retrieving the day and time from the UDP service "daytime" (port 13)
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on localhost.
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</p></div>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<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: </span><span style="color: #0000BB">$errno</span><span style="color: #DD0000"> - </span><span style="color: #0000BB">$errstr</span><span style="color: #DD0000"><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>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.stream-socket-client-notes">
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<h3 class="title">注释</h3>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="simpara">
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UDP sockets will sometimes appear to have opened without an error,
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even if the remote host is unreachable. The error will only
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become apparent when you read or write data to/from the socket.
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The reason for this is because UDP is a "connectionless" protocol,
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which means that the operating system does not try to establish
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a link for the socket until it actually needs to send or receive data.
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</p>
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</div>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">当指定数值型的 IPv6
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地址（例如 <em>fe80::1</em>）时必须用方括号将 IP 围起来——例如，
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<em>tcp://[fe80::1]:80</em>。</span></p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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Depending on the environment, the Unix domain or the optional
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connect timeout may not be available. A list of available
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transports can be retrieved using <span class="function"><a href="stream_get_transports.html" class="function">stream_get_transports()</a></span>.
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See <a href="transports.html" class="xref">所支持的套接字传输器（Socket Transports）列表</a> for a list of built in transports.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.stream-socket-client-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="stream_socket_server.html" class="function" rel="rdfs-seeAlso">stream_socket_server()</a> - Create an Internet or Unix domain server socket</span></li>
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<li class="member"><span class="function"><a href="stream_set_blocking.html" class="function" rel="rdfs-seeAlso">stream_set_blocking()</a> - 为资源流设置阻塞或者阻塞模式</span></li>
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<li class="member"><span class="function"><a href="stream_set_timeout.html" class="function" rel="rdfs-seeAlso">stream_set_timeout()</a> - Set timeout period on a stream</span></li>
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<li class="member"><span class="function"><a href="stream_select.html" class="function" rel="rdfs-seeAlso">stream_select()</a> - Runs the equivalent of the select() system call on the given
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arrays of streams with a timeout specified by tv_sec and tv_usec</span></li>
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<li class="member"><span class="function"><a href="fgets.html" class="function" rel="rdfs-seeAlso">fgets()</a> - 从文件指针中读取一行</span></li>
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<li class="member"><span class="function"><a href="fgetss.html" class="function" rel="rdfs-seeAlso">fgetss()</a> - 从文件指针中读取一行并过滤掉 HTML 标记</span></li>
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<li class="member"><span class="function"><a href="fwrite.html" class="function" rel="rdfs-seeAlso">fwrite()</a> - 写入文件（可安全用于二进制文件）</span></li>
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<li class="member"><span class="function"><a href="fclose.html" class="function" rel="rdfs-seeAlso">fclose()</a> - 关闭一个已打开的文件指针</span></li>
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<li class="member"><span class="function"><a href="feof.html" class="function" rel="rdfs-seeAlso">feof()</a> - 测试文件指针是否到了文件结束的位置</span></li>
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<li class="member"><a href="ref.curl.html" class="xref">cURL 函数</a></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |