在unixoid系统上（以及在Windows上的PHP 7+中），您可以使用getrusage，例如：
// Script start
$rustart = getrusage();
// Code ...
// Script end
function rutime($ru,$rus,$index) {
return ($ru["ru_$index.tv_sec"]*1000 + intval($ru["ru_$index.tv_usec"]/1000))
- ($rus["ru_$index.tv_sec"]*1000 + intval($rus["ru_$index.tv_usec"]/1000));
}
$ru = getrusage();
echo "This process used " . rutime($ru,$rustart,"utime") .
" ms for its computationsn";
echo "It spent " . rutime($ru,"stime") .
" ms in system callsn";
请注意，如果要为每个测试生成一个PHP实例，则无需计算差异。
如果您只需要挂钟时间而不是cpu执行时间，那么计算起来很简单：
//place this before any script you want to calculate time
$time_start = microtime(true);
//sample script
for($i=0; $i<1000; $i++){
//do anything
}
$time_end = microtime(true);
//dividing with 60 will give the execution time in minutes otherwise seconds
$execution_time = ($time_end - $time_start)/60;
//execution time of the script
echo 'Total Execution Time: '.$execution_time.' Mins';
// if you get weird results,use number_format((float) $execution_time,10)
请注意，这将包括PHP等待外部资源（如磁盘或数据库）的时间，这些资源不用于max_execution_time。
最简单的方法：
PHP
$time1 = microtime(true);
//script code
//...
$time2 = microtime(true);
echo 'script execution time: ' . ($time2 - $time1); //value in seconds
