如何用PHP获取精确到毫秒的时间戳？

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javascript获取微秒时间戳function makeMicroTime() { var time=microtime().split(' '); time=time[1] + (time[0] * 1000); time=time.split('.'); return time[0];}

function makeMicroTime(){ $time = explode ( " ", microtime () ); $time = $time [1] . ($time [0] * 1000); $time2 = explode ( ".", $time ); $time = $time2 [0]; return $time; } //该片段来自于www.codesnippet.cn/detail/1407201513082.html