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</div><hr /><div id="sockets.examples" class="chapter">
 <h1>Examples</h1>

 <p class="para">
  <div class="example" id="example-4587">
   <p><strong>Example #1 Socket example: Simple TCP/IP server</strong></p>
   <div class="example-contents"><p>
    This example shows a simple talkback server. Change the
    <var class="varname"><var class="varname">address</var></var> and <var class="varname"><var class="varname">port</var></var> variables
    to suit your setup and execute. You may then connect to the
    server with a command similar to: <strong class="command">telnet 192.168.1.53
    10000</strong> (where the address and port match your
    setup). Anything you type will then be output on the server
    side, and echoed back to you. To disconnect, enter &#039;quit&#039;.
   </p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
#!/usr/local/bin/php&nbsp;-q<br /><span style="color: #0000BB">&lt;?php<br />error_reporting</span><span style="color: #007700">(</span><span style="color: #0000BB">E_ALL</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Allow&nbsp;the&nbsp;script&nbsp;to&nbsp;hang&nbsp;around&nbsp;waiting&nbsp;for&nbsp;connections.&nbsp;*/<br /></span><span style="color: #0000BB">set_time_limit</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Turn&nbsp;on&nbsp;implicit&nbsp;output&nbsp;flushing&nbsp;so&nbsp;we&nbsp;see&nbsp;what&nbsp;we're&nbsp;getting<br />&nbsp;*&nbsp;as&nbsp;it&nbsp;comes&nbsp;in.&nbsp;*/<br /></span><span style="color: #0000BB">ob_implicit_flush</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$address&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'192.168.1.53'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$port&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">10000</span><span style="color: #007700">;<br /><br />if&nbsp;((</span><span style="color: #0000BB">$sock&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">socket_create</span><span style="color: #007700">(</span><span style="color: #0000BB">AF_INET</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">SOCK_STREAM</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">SOL_TCP</span><span style="color: #007700">))&nbsp;===&nbsp;</span><span style="color: #0000BB">false</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_create()&nbsp;failed:&nbsp;reason:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">())&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br />if&nbsp;(</span><span style="color: #0000BB">socket_bind</span><span style="color: #007700">(</span><span style="color: #0000BB">$sock</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$address</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$port</span><span style="color: #007700">)&nbsp;===&nbsp;</span><span style="color: #0000BB">false</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_bind()&nbsp;failed:&nbsp;reason:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</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">$sock</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br />if&nbsp;(</span><span style="color: #0000BB">socket_listen</span><span style="color: #007700">(</span><span style="color: #0000BB">$sock</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">)&nbsp;===&nbsp;</span><span style="color: #0000BB">false</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_listen()&nbsp;failed:&nbsp;reason:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</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">$sock</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br />do&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;((</span><span style="color: #0000BB">$msgsock&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">socket_accept</span><span style="color: #007700">(</span><span style="color: #0000BB">$sock</span><span style="color: #007700">))&nbsp;===&nbsp;</span><span style="color: #0000BB">false</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_accept()&nbsp;failed:&nbsp;reason:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">socket_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">socket_last_error</span><span style="color: #007700">(</span><span style="color: #0000BB">$sock</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Send&nbsp;instructions.&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$msg&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"\nWelcome&nbsp;to&nbsp;the&nbsp;PHP&nbsp;Test&nbsp;Server.&nbsp;\n"&nbsp;</span><span style="color: #007700">.<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"To&nbsp;quit,&nbsp;type&nbsp;'quit'.&nbsp;To&nbsp;shut&nbsp;down&nbsp;the&nbsp;server&nbsp;type&nbsp;'shutdown'.\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">socket_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$msgsock</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$msg</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$msg</span><span style="color: #007700">));<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;do&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">false&nbsp;</span><span style="color: #007700">===&nbsp;(</span><span style="color: #0000BB">$buf&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">socket_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$msgsock</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2048</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">PHP_NORMAL_READ</span><span style="color: #007700">)))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_read()&nbsp;failed:&nbsp;reason:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</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">$msgsock</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!</span><span style="color: #0000BB">$buf&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">trim</span><span style="color: #007700">(</span><span style="color: #0000BB">$buf</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;continue;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$buf&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #DD0000">'quit'</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">$buf&nbsp;</span><span style="color: #007700">==&nbsp;</span><span style="color: #DD0000">'shutdown'</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">socket_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$msgsock</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$talkback&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"PHP:&nbsp;You&nbsp;said&nbsp;'</span><span style="color: #0000BB">$buf</span><span style="color: #DD0000">'.\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">socket_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$msgsock</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$talkback</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$talkback</span><span style="color: #007700">));<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"</span><span style="color: #0000BB">$buf</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;while&nbsp;(</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">socket_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$msgsock</span><span style="color: #007700">);<br />}&nbsp;while&nbsp;(</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">socket_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$sock</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </p>
 <p class="para">
  <div class="example" id="example-4588">
   <p><strong>Example #2 Socket example: Simple TCP/IP client</strong></p>
   <div class="example-contents"><p>
    This example shows a simple, one-shot HTTP client. It simply
    connects to a page, submits a HEAD request, echoes the reply,
    and exits.
   </p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />error_reporting</span><span style="color: #007700">(</span><span style="color: #0000BB">E_ALL</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #DD0000">"&lt;h2&gt;TCP/IP&nbsp;Connection&lt;/h2&gt;\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;Get&nbsp;the&nbsp;port&nbsp;for&nbsp;the&nbsp;WWW&nbsp;service.&nbsp;*/<br /></span><span style="color: #0000BB">$service_port&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">getservbyname</span><span style="color: #007700">(</span><span style="color: #DD0000">'www'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'tcp'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Get&nbsp;the&nbsp;IP&nbsp;address&nbsp;for&nbsp;the&nbsp;target&nbsp;host.&nbsp;*/<br /></span><span style="color: #0000BB">$address&nbsp;</span><span style="color: #007700">=&nbsp;</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">/*&nbsp;Create&nbsp;a&nbsp;TCP/IP&nbsp;socket.&nbsp;*/<br /></span><span style="color: #0000BB">$socket&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">socket_create</span><span style="color: #007700">(</span><span style="color: #0000BB">AF_INET</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">SOCK_STREAM</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">SOL_TCP</span><span style="color: #007700">);<br />if&nbsp;(</span><span style="color: #0000BB">$socket&nbsp;</span><span style="color: #007700">===&nbsp;</span><span style="color: #0000BB">false</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_create()&nbsp;failed:&nbsp;reason:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</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">())&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"OK.\n"</span><span style="color: #007700">;<br />}<br /><br />echo&nbsp;</span><span style="color: #DD0000">"Attempting&nbsp;to&nbsp;connect&nbsp;to&nbsp;'</span><span style="color: #0000BB">$address</span><span style="color: #DD0000">'&nbsp;on&nbsp;port&nbsp;'</span><span style="color: #0000BB">$service_port</span><span style="color: #DD0000">'..."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">socket_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$address</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$service_port</span><span style="color: #007700">);<br />if&nbsp;(</span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">===&nbsp;</span><span style="color: #0000BB">false</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"socket_connect()&nbsp;failed.\nReason:&nbsp;(</span><span style="color: #0000BB">$result</span><span style="color: #DD0000">)&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</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">$socket</span><span style="color: #007700">))&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"OK.\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$in&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"HEAD&nbsp;/&nbsp;HTTP/1.1\r\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$in&nbsp;</span><span style="color: #007700">.=&nbsp;</span><span style="color: #DD0000">"Host:&nbsp;www.example.com\r\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$in&nbsp;</span><span style="color: #007700">.=&nbsp;</span><span style="color: #DD0000">"Connection:&nbsp;Close\r\n\r\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$out&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">''</span><span style="color: #007700">;<br /><br />echo&nbsp;</span><span style="color: #DD0000">"Sending&nbsp;HTTP&nbsp;HEAD&nbsp;request..."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">socket_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$in</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$in</span><span style="color: #007700">));<br />echo&nbsp;</span><span style="color: #DD0000">"OK.\n"</span><span style="color: #007700">;<br /><br />echo&nbsp;</span><span style="color: #DD0000">"Reading&nbsp;response:\n\n"</span><span style="color: #007700">;<br />while&nbsp;(</span><span style="color: #0000BB">$out&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">socket_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2048</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$out</span><span style="color: #007700">;<br />}<br /><br />echo&nbsp;</span><span style="color: #DD0000">"Closing&nbsp;socket..."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">socket_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$socket</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #DD0000">"OK.\n\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </p>
</div>
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