php小白数组求解 根据某一个键值重新排序数组 给分100 急！！！

[sinat_30659463]

这样一个json数组
[ {"id":"1","name":"21g","dis":"33"},
{"id":"2","name":"21g","dis":"22"},
{"id":"3","name":"21g","dis":"3"},
{"id":"4","name":"21g","dis":"5"},
{"id":"5","name":"21g","dis":"12"}]
需要根据dis从小到大排序成
[{"id":"3","name":"21g","dis":"3"},
{"id":"4","name":"21g","dis":"5"},
{"id":"5","name":"21g","dis":"12"},
{"id":"2","name":"21g","dis":"22"},
{"id":"1","name":"21g","dis":"33"}]

求步骤详情 在线等 急！！！

[sinat_30659463]

谢谢谢谢！！ 已经弄好了！

[xuzuning]

$s =<<< TXT
[ {"id":"1","name":"21g","dis":"33"},
  {"id":"2","name":"21g","dis":"22"},
  {"id":"3","name":"21g","dis":"3"},
  {"id":"4","name":"21g","dis":"5"},
  {"id":"5","name":"21g","dis":"12"}]    
TXT;
$a = json_decode($s, true);
foreach($a as $v) $r[] = $v['dis'];
array_multisort($r, $a);
echo json_encode($a);

[{"id":"3","name":"21g","dis":"3"},{"id":"4","name":"21g","dis":"5"},{"id":"5","name":"21g","dis":"12"},{"id":"2","name":"21g","dis":"22"},{"id":"1","name":"21g","dis":"33"}]

[周南卷耳]

默默写了个冒泡排序

$s =<<< TXT
[ {"id":"1","name":"21g","dis":"33"},
  {"id":"2","name":"21g","dis":"22"},
  {"id":"3","name":"21g","dis":"3"},
  {"id":"4","name":"21g","dis":"5"},
  {"id":"5","name":"21g","dis":"12"}]    
TXT;
$a = json_decode($s, true);
for ($i=0; $i < 5 ; $i++) { 
	for ($k=4; $k>$i ; $k--) { 
		if ($a[$k]['dis']<$a[$k-1]['dis']) {
			$temp = $a[$k];
			$a[$k] = $a[$k-1];
			$a[$k-1] = $temp;
		}
	}
}
print_r($a);