<?php

 
phpinfo();
 
 
/**
 * Simple function to replicate PHP 5 behaviour
 */
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
 
$time_start = microtime_float();
 
// Sleep for a while
usleep(100);
 
$time_end = microtime_float();
$time = $time_end - $time_start;
 
echo "exec time in $time seconds\n";
?> 
 
能计算php脚本time