Universal two-dimensional array sorting algorithm function

Reprint address: http://blog.qita.in/?post=468

//Two-dimensional array sorting, $arr is the data, $keys is the key value of sorting, $order is the sorting rule, 1 is ascending order, 0 is descending order

function array_sort($arr, $keys, $order=0) {

if (!is_array($arr)) {

 return false;

}

$keysvalue = array();

foreach($arr as $key => $val) {

 $keysvalue[$key] = $val[$keys];

}

if($order == 0){

 asort($keysvalue);

}else {

 arsort ($keysvalue);

}

reset($keysvalue);

foreach($keysvalue as $key => $vals) {

 $keysort[$key] = $key;

}

$ new_array = array();

foreach($keysort as $key => $val) {

 $new_array[$key] = $arr[$val];

}

return $new_array;

}

//eg
$arr = array('0'=>array('a'=>2,'b'=>4,'c'=>3),
 '1'=> ;array('a'=>45,'b'=>3,'c'=>3),
 '2'=>array('a'=>2,'b'=> ;7,'c'=>3),
);
$new_array = array_sort($arr,'a',0);
print_r($new_array);