function getmicrotime(){ list($usec, $sec) = explode(" ",microtime()); return ((float)$usec + (float)$sec); }
$time_start = getmicrotime();//开始计时, 放在程序头
for ($i=0; $i < 1000; $i++){ //do nothing, 1000 times }
$time_end = getmicrotime();//结束计时, 放在尾部 $time = $time_end - $time_start;
echo "Did nothing in $time seconds";
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