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204 lines
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204 lines
15 KiB
HTML
<!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>从已连接的socket接收数据</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.socket-recv" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">socket_recv</h1>
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<p class="verinfo">(PHP 4 >= 4.1.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">socket_recv</span> — <span class="dc-title">从已连接的socket接收数据</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.socket-recv-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>socket_recv</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$socket</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$buf</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$len</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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函数 <span class="function"><strong>socket_recv()</strong></span> 从 <code class="parameter">socket</code> 中接受长度为
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<code class="parameter">len</code> 字节的数据，并保存在 <code class="parameter">buf</code> 中。
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<span class="function"><strong>socket_recv()</strong></span> 用于从已连接的socket中接收数据。除此之外，可以设定一个或多个 flags
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来控制函数的具体行为。
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</p>
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<p class="para">
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<code class="parameter">buf</code> 以引用形式传递，因此必须是一个以声明的有效的变量。从
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<code class="parameter">socket</code> 中接收到的数据将会保存在 <code class="parameter">buf</code> 中。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.socket-recv-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">socket</code></dt>
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<dd>
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<p class="para">
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参数 <code class="parameter">socket</code> 必须是一个由 <span class="function"><a href="socket_create.html" class="function">socket_create()</a></span>
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创建的socket资源。
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</p>
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</dd>
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<dt>
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<code class="parameter">buf</code></dt>
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<dd>
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<p class="para">
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从socket中获取的数据将被保存在由 <code class="parameter">buf</code> 制定的变量中。
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如果有错误发生，如链接被重置，数据不可用等等， <code class="parameter">buf</code> 将被设为 <strong><code>NULL</code></strong>。
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</p>
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</dd>
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<dt>
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<code class="parameter">len</code></dt>
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<dd>
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<p class="para">
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长度最多为 <code class="parameter">len</code> 字节的数据将被接收。
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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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<code class="parameter">flags</code> 的值可以为下列任意flag的组合。使用按位或运算符(<em>|</em>)来
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组合不同的flag。
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</p>
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<table class="doctable table">
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<caption><strong>可用的 <code class="parameter">flags</code> 值</strong></caption>
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<thead>
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<tr>
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<th>Flag</th>
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<th>描述</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td><strong><code>MSG_OOB</code></strong></td>
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<td>
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处理超出边界的数据
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</td>
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</tr>
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<tr>
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<td><strong><code>MSG_PEEK</code></strong></td>
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<td>
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从接受队列的起始位置接收数据，但不将他们从接受队列中移除。
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</td>
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</tr>
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<tr>
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<td><strong><code>MSG_WAITALL</code></strong></td>
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<td>
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在接收到至少 <code class="parameter">len</code> 字节的数据之前，造成一个阻塞，并暂停脚本运行（block）。但是，
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如果接收到中断信号，或远程服务器断开连接，该函数将返回少于 <code class="parameter">len</code> 字节的数据。
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</td>
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</tr>
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<tr>
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<td><strong><code>MSG_DONTWAIT</code></strong></td>
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<td>
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如果制定了该flag，函数将不会造成阻塞，即使在全局设置中指定了阻塞设置。
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</td>
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</tr>
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</tbody>
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</table>
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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.socket-recv-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="function"><strong>socket_recv()</strong></span> 返回一个数字，表示接收到的字节数。如果发生了错误，则返回 <strong><code>FALSE</code></strong>
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错误码可使用 <span class="function"><a href="socket_last_error.html" class="function">socket_last_error()</a></span> 接收。也可使用函数 <span class="function"><a href="socket_strerror.html" class="function">socket_strerror()</a></span>
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来取得关于错误的文字描述。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.socket-recv-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="snmp.set.example.multiple">
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<p><strong>Example #1 <span class="function"><strong>socket_recv()</strong></span> 范例</strong></p>
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<div class="example-contents"><p>
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该范例简单地使用 <span class="function"><strong>socket_recv()</strong></span> 重写了 <a href="sockets.examples.html" class="xref">范例</a> 中的
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第一个例子。
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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 />error_reporting</span><span style="color: #007700">(</span><span style="color: #0000BB">E_ALL</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"<h2>TCP/IP Connection</h2>\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Get the port for the WWW service. */<br /></span><span style="color: #0000BB">$service_port </span><span style="color: #007700">= </span><span style="color: #0000BB">getservbyname</span><span style="color: #007700">(</span><span style="color: #DD0000">'www'</span><span style="color: #007700">, </span><span style="color: #DD0000">'tcp'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Get the IP address for the target host. */<br /></span><span style="color: #0000BB">$address </span><span style="color: #007700">= </span><span style="color: #0000BB">gethostbyname</span><span style="color: #007700">(</span><span style="color: #DD0000">'www.example.com'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Create a TCP/IP socket. */<br /></span><span style="color: #0000BB">$socket </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_create</span><span style="color: #007700">(</span><span style="color: #0000BB">AF_INET</span><span style="color: #007700">, </span><span style="color: #0000BB">SOCK_STREAM</span><span style="color: #007700">, </span><span style="color: #0000BB">SOL_TCP</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$socket </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"socket_create() failed: reason: " </span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">()) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"OK.\n"</span><span style="color: #007700">;<br />}<br /><br />echo </span><span style="color: #DD0000">"Attempting to connect to '</span><span style="color: #0000BB">$address</span><span style="color: #DD0000">' on port '</span><span style="color: #0000BB">$service_port</span><span style="color: #DD0000">'..."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">$address</span><span style="color: #007700">, </span><span style="color: #0000BB">$service_port</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">=== </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"socket_connect() failed.\nReason: (</span><span style="color: #0000BB">$result</span><span style="color: #DD0000">) " </span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">)) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"OK.\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$in </span><span style="color: #007700">= </span><span style="color: #DD0000">"HEAD / HTTP/1.1\r\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$in </span><span style="color: #007700">.= </span><span style="color: #DD0000">"Host: www.example.com\r\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$in </span><span style="color: #007700">.= </span><span style="color: #DD0000">"Connection: Close\r\n\r\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$out </span><span style="color: #007700">= </span><span style="color: #DD0000">''</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">"Sending HTTP HEAD request..."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">socket_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">$in</span><span style="color: #007700">, </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$in</span><span style="color: #007700">));<br />echo </span><span style="color: #DD0000">"OK.\n"</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">"Reading response:\n\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$buf </span><span style="color: #007700">= </span><span style="color: #DD0000">'This is my buffer.'</span><span style="color: #007700">;<br />if (</span><span style="color: #0000BB">false </span><span style="color: #007700">!== (</span><span style="color: #0000BB">$bytes </span><span style="color: #007700">= </span><span style="color: #0000BB">socket_recv</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">, </span><span style="color: #0000BB">$buf</span><span style="color: #007700">, </span><span style="color: #0000BB">2048</span><span style="color: #007700">, </span><span style="color: #0000BB">MSG_WAITALL</span><span style="color: #007700">))) {<br /> echo </span><span style="color: #DD0000">"Read </span><span style="color: #0000BB">$bytes</span><span style="color: #DD0000"> bytes from socket_recv(). Closing socket..."</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">"socket_recv() failed; reason: " </span><span style="color: #007700">. </span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">)) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">socket_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">$buf </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">"OK.\n\n"</span><span style="color: #007700">;<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 class="example-contents"><p>
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The above example will produce something like:
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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<h2>TCP/IP Connection</h2>
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OK.
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Attempting to connect to '208.77.188.166' on port '80'...OK.
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Sending HTTP HEAD request...OK.
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Reading response:
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Read 123 bytes from socket_recv(). Closing socket...HTTP/1.1 200 OK
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Date: Mon, 14 Sep 2009 08:56:36 GMT
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Server: Apache/2.2.3 (Red Hat)
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Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT
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ETag: "b80f4-1b6-80bfd280"
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Accept-Ranges: bytes
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Content-Length: 438
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Connection: close
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Content-Type: text/html; charset=UTF-8
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OK.
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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></div></div></body></html> |