PHP | Order pictures array by rectangular

Question

I have an array like this one:

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

Now I want to order this array by the biggest rectangular in the length for example in this array it is the number with width=>"213" and height=>"50"

My try to do this was that, using usort() :

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

But it sort's the pictures just for their size. Anybody a idea?

Answer 1

Assuming length as the width of the image -

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

And if you mean by area of the rectangular image -

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