php 用sleep(s)來進行停頓，那么小于1秒的停頓怎么弄呢？那就是usleep ，不過，usleep只能在unix（linux）系統(tǒng)下運行哦。

echo "\n\rsleep begin:".microtime_float();

sleep(1);

echo "\n\rsleep 1 s:".microtime_float();

sleep(2);

echo "\n\rsleep 2 s:".microtime_float();

//

echo "\n\rusleep begin:".microtime_float();

usleep(50*1000);

echo "\n\rusleep 50 ms:".microtime_float();

usleep(990*1000);

echo "\n\rusleep 990 ms:".microtime_float();

~

數(shù)據(jù)結果如下

sleep begin:1381225780.5979

sleep 1 s:1381225781.5991

sleep 2 s:1381225783.6

usleep begin:1381225783.6

usleep 50 ms:1381225783.651

usleep 990 ms:1381225784.6419

microtime_float函數(shù)如下

function microtime_float(){

list($usec, $sec) = explode(" ", microtime());

return ((float)$usec + (float)$sec);

}

更多信息請查看IT技術專欄