php获取当前时间毫秒

msectime.php

<?php

//method 1
function msectime() {
    list($msec, $sec) = explode(' ', microtime());
    return (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
}

//method 2
function msetime2()
{
    return (int)(microtime(true)*1000);
}