PHP輸出毫秒時間戳

代碼：

<?php
list($msec, $sec) = explode(' ', microtime());
$msectime = (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
echo $msectime;

?>

輸出：

1555923393483

封裝成一個方法：

public static function msectime()
{
    list($msec, $sec) = explode(' ', microtime());

    return (float)sprintf('%.0f', (floatval($msec) + floatval($sec)) * 1000);
}