Sorting multidimensional array

问题

I am adding elements to multidimensional array like this

foreach($results as $res){
  $fwidth=$res[0];
  $fpath=$res[1];

  $sub = array (
    'img_w' => $fwidth,
    'img_path' => $fpath,
  );

  $widths[] = $sub;
}

And i want to sort $widths array by 'img_w' from bigger to smaller (DESC).

Can anyone help me? Thanks in advance.

回答1:

Use PHP's USort() function (user sort), which takes two arguments. The first is the array you want to sort. The second is a function that does the actual sorting (you write it yourself). The page I linked to has some examples that should cover your case.

来源：https://stackoverflow.com/questions/5780157/sorting-multidimensional-array