php多维数组去重,该如何解决

php多维数组去重
php多维数组去重，怎样去掉name为a的多余的那一个呢？
Array
(
[0] => Array
(
[id] => 79
[name] => a
)

[1] => Array
(

[id] => 79
[name] => a
)
[2] => Array
(
[id] => 78
[name] => b
)
[3] => Array
(

[id] => 36
[name] => c
)
)
------解决思路----------------------

$ar = array (
  0 => 
  array (
    'id' => '79',
    'name' => 'a',
  ),
  1 => 
  array (
    'id' => '79',
    'name' => 'a',
  ),
  2 => 
  array (
    'id' => '78',
    'name' => 'b',
  ),
  3 => 
  array (
    'id' => '36',
    'name' => 'c',
  ),
);
foreach($ar as $k=>$f) {
  foreach($ar as $p=>$t) if($k != $p && $f == $t) unset($ar[$k]);
}
print_r($ar);

Array
(
    [1] => Array
        (
            [id] => 79
            [name] => a
        )

    [2] => Array
        (
            [id] => 78
            [name] => b
        )

    [3] => Array
        (
            [id] => 36
            [name] => c
        )

)

------解决思路----------------------

$arr=array(
     0=>array(
        'id'=>79,
        'name'=>'a'
         ),
     1=>array(
        'id'=>79,
        'name'=>'a'

      ),
     2=>array(
        'id'=>78,
        'name'=>'b'
     ),
     3=>array(
        'id'=>36,
        'name'=>'c'
     ),
);
$item=array();
foreach($arr as $k=>$v){
    if(!isset($item[$v['id']])) $item[$v['id']]=$v;
}
print_r(array_values($item));

Array
(
    [0] => Array
        (
            [id] => 79
            [name] => a
        )

    [1] => Array
        (
            [id] => 78
            [name] => b
        )

    [2] => Array
        (
            [id] => 36
            [name] => c
        )

)

------解决思路----------------------

$ar = array (
  0 => 
  array (
    'id' => '79',
    'name' => 'a',
  ),
  1 => 
  array (
    'id' => '79',
    'name' => 'a',
  ),
  2 => 
  array (
    'id' => '78',
    'name' => 'b',
  ),
  3 => 
  array (
    'id' => '36',
    'name' => 'c',
  ),
);


$temp =array();
$result =array();

foreach($ar as $item){
	$temp[] = json_encode($item);
}

$temp = array_unique($temp);

foreach($temp as $item){
	$result[] = json_decode($item,true);
}

var_dump($result);

只是提供新思路 效率不高 勿用

array(3) {
  [0]=>
  array(2) {
    ["id"]=>
    string(2) "79"
    ["name"]=>
    string(1) "a"
  }
  [1]=>
  array(2) {
    ["id"]=>
    string(2) "78"
    ["name"]=>
    string(1) "b"
  }
  [2]=>
  array(2) {
    ["id"]=>
    string(2) "36"
    ["name"]=>
    string(1) "c"
  }
}

------解决思路----------------------
SELECT DISTINCT(`id`) AS `id` , name FROM `TABLE`