本文实例讲述了php计算函数执行时间的方法。分享给大家供大家参考。具体如下：
我们可以通过在程序的前后分别记录开始和结束时间，两个时间差就是程序的执行时间。
代码如下:
$long_str = "this is a test to see how much time md5 function takes to execute over this string";
// start timing from here
$start = microtime(true);
// function to test
$md5 = md5($long_str);
$elapsed = microtime(true) - $start;
echo "That took $elapsed seconds.\n";
?>
// start timing from here
$start = microtime(true);
// function to test
$md5 = md5($long_str);
$elapsed = microtime(true) - $start;
echo "That took $elapsed seconds.\n";
?>
运行结果如下：
That took 7.1525573730469E-6 seconds.
希望本文所述对大家的php程序设计有所帮助。
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