Php Hh:mm:SS至毫秒

我想把时间（hh:mm:ss）转换成毫秒。那我怎么做呢

例： 时间是：00:00:11

注意：我需要一个PHP代码

$time = '11:22:33';    
$seconds = strtotime("1970-01-01 $time UTC");
$miliseconds = $seconds * 1000;

echo $seconds ."\n" . $miliseconds;

输出： 40953

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40953000日期到时间的转换如下

    $Given_date   = date('H:i:s');

    $hour         = date('H',strtotime($Given_date));
    $minute       = date('i',strtotime($Given_date));
    $seconds      = date('s',strtotime($Given_date));

    $sec_to_milli = $seconds * 1000;            //seconds to milliseconds
    $min_to_milli = $minute * 60 * 1000;        //minutes to milliseconds
    $hrs_to_milli = $hour * 60 * 60 * 1000;     //hours to milliseconds

    $milliseconds = $hrs_to_milli + $min_to_milli + $sec_to_milli;

    echo $milliseconds;

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我想OP需要的是毫秒而不是秒。

    $Given_date   = date('H:i:s');

    $hour         = date('H',strtotime($Given_date));
    $minute       = date('i',strtotime($Given_date));
    $seconds      = date('s',strtotime($Given_date));

    $sec_to_milli = $seconds * 1000;            //seconds to milliseconds
    $min_to_milli = $minute * 60 * 1000;        //minutes to milliseconds
    $hrs_to_milli = $hour * 60 * 60 * 1000;     //hours to milliseconds

    $milliseconds = $hrs_to_milli + $min_to_milli + $sec_to_milli;

    echo $milliseconds;