本文實例講述了php計算函數執行時間的方法。分享給大家供大家參考。具體如下：
我們可以通過在程序的前后分別記錄開始和結束時間，兩個時間差就是程序的執行時間。
復制代碼代碼如下:
<?php
$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";
?>
$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";
?>
運行結果如下：
That took 7.1525573730469E-6 seconds.
希望本文所述對大家的php程序設計有所幫助。
