<code><span>//修改php的默认时区</span>date_default_timezone_get(<span>'PRC'</span>);<span>//使用微妙计算php脚本执行时间</span><span>echo</span> microtime(); <span>echo</span><span>" 返回当前unix时间戳和微秒数"</span>;<span>echo</span><span>"<br>"</span>;<span><span>class</span><span>Timer</span>{</span><span>private</span><span>$startTime</span>; <span>private</span><span>$stopTime</span>; <span><span>function</span><span>__construct</span><span>()</span>{</span><span>$this</span>->startTime=<span>0</span>; <span>$this</span>->stopTime=<span>0</span>; } <span><span>function</span><span>start</span><span>()</span>{</span><span>$this</span>->startTime=microtime(<span>true</span>); } <span><span>function</span><span>stop</span><span>()</span>{</span><span>$this</span>->stopTime=microtime(<span>true</span>); } <span><span>function</span><span>spent</span><span>()</span>{</span><span>return</span> round((<span>$this</span>->stopTime - <span>$this</span>->startTime),<span>4</span>); }}<span>$timer</span>= <span>new</span> Timer();<span>$timer</span>->start();usleep(<span>1000</span>);<span>$timer</span>->stop();<span>echo</span><span>"执行该脚本用时<b>"</span>.<span>$timer</span>->spent().<span>"</b>秒<br>"</span>;</code>
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