记录一下，以后备用
<ol class="dp-xml">
<li class="alt"><span><span class="tag"></span><span class="tag-name">php</span><span> </span></span></li>
<li>
<span>$</span><span class="attribute">host</span><span> = </span><span class="attribute-value">www.google.com</span><span>; //要ping的地址，也可以是IP </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">port</span><span> = </span><span class="attribute-value">80</span><span>; //要ping的端口 </span>
</li>
<li>
<span>$</span><span class="attribute">num</span><span> = </span><span class="attribute-value">3</span><span>; </span>
</li>
<li class="alt"><span>function microtime_float() </span></li>
<li><span>{ </span></li>
<li class="alt"><span>list($usec, $sec) = explode(" ", microtime()); </span></li>
<li><span>return ((float)$usec + (float)$sec); </span></li>
<li class="alt"><span>} </span></li>
<li><span>function ping($host,$port) </span></li>
<li class="alt"><span>{ </span></li>
<li>
<span>$</span><span class="attribute">time_start</span><span> = </span><span class="attribute-value">microtime_float</span><span>(); </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">ip</span><span> = </span><span class="attribute-value">gethostbyname</span><span>($host); </span>
</li>
<li>
<span>$</span><span class="attribute">fp</span><span> = @fsockopen($host,$port,&$errno,&$errstr,1); </span>
</li>
<li class="alt"><span>if(!$fp) return replay time out!; </span></li>
<li>
<span>$</span><span class="attribute">get</span><span> = </span><span class="attribute-value">"GET / HTTP/1.1
Host:"</span><span>.$host."
Connection: Close
"; </span>
</li>
<li class="alt"><span>@fputs($fp,$get); </span></li>
<li><span>@fclose($fp); </span></li>
<li class="alt">
<span>$</span><span class="attribute">time_end</span><span> = </span><span class="attribute-value">microtime_float</span><span>(); </span>
</li>
<li>
<span>$</span><span class="attribute">time</span><span> = $time_end - $time_start; </span>
</li>
<li class="alt">
<span>$</span><span class="attribute">time</span><span> = </span><span class="attribute-value">ceil</span><span>($time * 1000); </span>
</li>
<li>
<span>return Reply from .$ip.: </span><span class="attribute">time</span><span>=.$time.</span><span class="attribute-value">ms</span><span class="tag"><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>; </span></span>
</li>
<li class="alt"><span>} </span></li>
<li>
<span>echo Pinging .$host. [.gethostbyname($host).] with Port:.$port. of data:</span><span class="tag"><span class="tag-name">br</span><span> </span><span class="tag">/></span><span class="tag"><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>."
"; </span></span></span>
</li>
<li class="alt">
<span>for($</span><span class="attribute">i</span><span> = </span><span class="attribute-value">0</span><span>;$i </span><span class="tag"><span> $num;$i++) </span></span>
</li>
<li><span>{ </span></li>
<li class="alt"><span>ping($host,$port); </span></li>
<li><span>sleep(1); </span></li>
<li class="alt"><span>ob_flush(); </span></li>
<li><span>flush(); </span></li>
<li class="alt"><span>} </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>本文摘自 http://www.cnblogs.com/luoine/archive/2010/12/01/1893156.html
