解读PHP计算页面执行时间的具体代码实现_PHP教程

<OL class=dp-xml><LI class=alt><SPAN><STRONG><FONT color=#006699><SPAN class=tag><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN> </SPAN></SPAN><LI class=""><SPAN>class runtime  </SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>    var $</SPAN><SPAN class=attribute><FONT color=#ff0000>StartTime</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>0</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=alt><SPAN>    var $</SPAN><SPAN class=attribute><FONT color=#ff0000>StopTime</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>0</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>    function get_microtime()  </SPAN><LI class=""><SPAN>    {  </SPAN><LI class=alt><SPAN>        list($usec, $sec) = explode(' ', microtime());  </SPAN><LI class=""><SPAN>        return ((float)$usec + (float)$sec);  </SPAN><LI class=alt><SPAN>    }  </SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>    function start()  </SPAN><LI class=""><SPAN>    {  </SPAN><LI class=alt><SPAN>        $this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN class=attribute><FONT color=#ff0000>StartTime</FONT></SPAN><SPAN> = $this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>get_microtime();  </SPAN></SPAN><LI class=""><SPAN>    }  </SPAN><LI class=alt><SPAN>   </SPAN><LI class=""><SPAN>    function stop()  </SPAN><LI class=alt><SPAN>    {  </SPAN><LI class=""><SPAN>        $this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN class=attribute><FONT color=#ff0000>StopTime</FONT></SPAN><SPAN> = $this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>get_microtime();  </SPAN></SPAN><LI class=alt><SPAN>    }  </SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>    function spent()  </SPAN><LI class=""><SPAN>    {  </SPAN><LI class=alt><SPAN>        return round(($this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>StopTime - $this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>StartTime) * 1000, 1);  </SPAN></SPAN><LI class=""><SPAN>    }  </SPAN><LI class=alt><SPAN>   </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN>   </SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>//例子  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>runtime</FONT></SPAN><SPAN>= </SPAN><SPAN class=attribute-value><FONT color=#0000ff>new</FONT></SPAN><SPAN> runtime;  </SPAN></SPAN><LI class=alt><SPAN>$runtime-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>start();  </SPAN></SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>//你的代码开始  </SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>a</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>0</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=""><SPAN>for($</SPAN><SPAN class=attribute><FONT color=#ff0000>i</FONT></SPAN><SPAN>=</SPAN><SPAN class=attribute-value><FONT color=#0000ff>0</FONT></SPAN><SPAN>; $i</SPAN><STRONG><FONT color=#006699><SPAN class=tag><</SPAN><SPAN class=tag-name>1000000</SPAN></FONT></STRONG><SPAN>; $i++)  </SPAN></SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>    $a += $i;  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>//你的代码结束  </SPAN><LI class=""><SPAN>   </SPAN><LI class=alt><SPAN>$runtime-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>stop();  </SPAN></SPAN><LI class=""><SPAN>echo "页面执行时间: ".$runtime-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN>spent()." 毫秒";  </SPAN></SPAN><LI class=alt><SPAN>   </SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></FONT></STRONG></SPAN><SPAN> </SPAN></SPAN></LI></OL>