+= 是做什么用的？

我认为这是一个愚蠢的问题，但我在 php 上找不到它。为什么下面的代码中++=：

function calculateRanking()
{
    $created = $this->getCreated();

    $diff = $this->getTimeDifference($created, date('F d, Y h:i:s A'));

    $time = $diff['days'] * 24;
    $time += $diff['hours'];
    $time += ($diff['minutes'] / 60);
    $time += (($diff['seconds'] / 60)/60);

    $base = $time + 2;        

    $this->ranking = ($this->points - 1) / pow($base, 1.5);

    $this->save();
}

是说 $time 具有所有这些值，还是将所有值添加到 $time 中？

Thanks

它将所有这些值添加到时间中。

something += somethingelse

是一个快捷方式

something = something + somethingelse

-Adam