怎么合并数组相同的值

求大神指导，我想把数组相同的值合并，原本是这样的
array(5) {
[0] => array(1) {
["id"] => string(1) "2"
}
[1] => array(1) {
["id"] => string(1) "2"
}
[2] => array(1) {
["id"] => string(1) "1"
}
[3] => array(1) {
["id"] => string(1) "1"
}
}
我想要的效果是以下这样的
array(5) {
[0] => array(1) {
["id"] => string(1) "1"
}
[1] => array(1) {
["id"] => string(1) "2"
}
}

回复讨论(解决方案)

$ar = array (  0 => array (    "id" => "2"  ),  1 => array (    "id" => "2"  ),  2 => array (    "id" => "1"  ),  3 => array (    "id" => "1"  ),);$arr = array();foreach($ar as $v){   if(!isset($arr[$v['id']])) $arr[$v['id']] = $v;}ksort($arr);print_r(array_values($arr));