(PHP 4, PHP 5, PHP 7)
usleep — 锟斤拷指锟斤拷锟斤拷微锟斤拷锟斤拷锟接筹拷执锟斤拷
$micro_seconds
) : void锟斤拷指锟斤拷锟斤拷微锟斤拷锟斤拷锟接伙拷锟斤拷锟斤拷锟街达拷小锟�
micro_seconds锟斤拷停锟斤拷时锟斤拷锟斤拷微锟斤拷啤锟�1微锟诫（micro second锟斤拷锟角帮拷锟斤拷锟街伙拷搿�
没锟叫凤拷锟斤拷值锟斤拷
Example #1 usleep()锟斤拷锟斤拷
<?php
// Current time
echo date('h:i:s') . "\n";
// wait for 2 seconds
usleep(2000000);
// back!
echo date('h:i:s') . "\n";
?>
锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�
11:13:28 11:13:30