PHP 按最大宽度和宽度大于高度对图片进行排序

Question

我有一个像这样的数组:

 array(
    0 => array(
       width => "213",
       height => "50"
    ),
    1 => array(
       width => "120",
       height => "204"
    )
 ) etc...

现在我想按宽度最大且宽度大于高度的图片对这个数组进行排序。

我的尝试是使用usort():

usort($results['bossresponse']['images']['results'], function($a, $b) { 
            return $b['width'] - $a['width'];
});

但它只是根据图片的宽度进行排序，而不是如果图片的宽度大于高度。用usort可以吗？

Answer 1

试试这个:

usort($results['bossresponse']['images']['results'], function($a, $b) { 
    //Case if A has bigger width than height but B doesn't
    if($a["width"]>$a["height"] && !($b["width"]>$b["height"])) return -1;

    //Case if B has bigger width than height but A doesn't
    if(!($a["width"]>$a["height"]) && $b["width"]>$b["height"]) return 1;

    //They both/neither have bigger width than height, so compare widths
    if($a["width"]>$b["width"]) return -1;
        elseif($b["width"]>$a["width"]) return 1;
        else return 0;
});