php获取毫秒级别的时间戳

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function getMillisecond()

{

    //获取毫秒的时间戳

    $time = explode ( " ", microtime () );

    $time = $time[1] . ($time[0] * 1000);

    $time2 = explode( ".", $time );

    $time = $time2[0];

    return $time;

}