php自定义排序uasort函数示例【二维数组按指定键值排序】

/*
 * 二维数组按指定键值排须
 */
function arr_sort($array,$key,$order="asc"){//asc是升序 desc是降序//按 I<L<M<H 排序
  $arr_nums=$arr=array();
  foreach($array as $k=>$v){
    $arr_nums[$k]=$v[$key];
  }
  if($order=='asc'){
    uasort($arr_nums,'my_sort_asc');
  }else{
    uasort($arr_nums,'my_sort_desc');
  }
  foreach($arr_nums as $k=>$v){
    $arr[$k]=$array[$k];
  }
  return $arr;
}
function my_sort_desc($a,$b){
  if($a==$b) return 0;
  if($a=='I' && $b!='I') return 1;
  if($a=='L' && $b!='I') return 1;
  if($a=='L' && $b=='I') return -1;
  if($a=='M' && $b!='H') return -1;
  if($a=='M' && $b=='H') return 1;
  if($a=='H' && $b!='H') return -1;
}
function my_sort_asc($a,$b){
  if($a==$b) return 0;
  if($a=='I' && $b!='I') return -1;
  if($a=='L' && $b!='I') return -1;
  if($a=='L' && $b=='I') return 1;
  if($a=='M' && $b!='H') return 1;
  if($a=='M' && $b=='H') return -1;
  if($a=='H' && $b!='H') return 1;
}