PHP ʖ²ἯTH º󍋼/A microtime ˵÷ =ד 1. microtime() =ד function getmicrotime(){ list($usec, $sec) = explode(" ",microtime()); return ((float)$usec + (float)$sec);} $time_start = getmicrotime(); for ($i=0; $i 1000; $i++){ //do nothing, 1000 times} $time_end = getmicrotime(); $time = $time_end - $time_start; echo "Did nothing in $time seconds"; º󍋼/A ưµ㼯A localtime ɏһ¼¶ mktime