请问一个数组整理方法

请教一个数组整理方法

$abc = array(
    a1=>array(a=>1,b=>1,c=1,d=2),
    a2=>array(a=>1,b=>2,c=2,d=2),
    a3=>array(a=>3,b=>2,c=3,d=2)
)

现在我需要将上面的二维数组合并为一维数组。
一维数组需要包含a=1 and b=1 这个数组的所有信息 和 a=3 这个数组的所有信息，我想请问一下，这种整理，使用一个foreach 可以整理出来么。
------解决方案--------------------

$abc = array(
  'a1' => array('a' => 1, 'b' => 1, 'c' => 1, 'd' => 2),
  'a2' => array('a' => 1, 'b' => 2, 'c' => 2, 'd' => 2),
  'a3' => array('a' => 3, 'b' => 2, 'c' => 3, 'd' => 2),
);

$filter = array(
  array( 'a' => 1, 'b' => 1),
  array( 'a' => 3),
);

$res = array();
foreach($abc as $item) {
  foreach($filter as $f) {
    if(array_intersect_assoc($f, $item) == $f)
      $res = array_merge($res, array_values($item));
  }
}
print_r($res);

Array
(
    [0] => 1
    [1] => 1
    [2] => 1
    [3] => 2
    [4] => 3
    [5] => 2
    [6] => 3
    [7] => 2
)

------解决方案--------------------

$abc = array(
    'a1'=>array('a'=>'1','b'=>'1','c'=>'1','d'=>'2'),
    'a2'=>array('a'=>'1','b'=>'2','c'=>'2','d'=>'2'),
    'a3'=>array('a'=>'3','b'=>'2','c'=>'3','d'=>'2')
);
$data1 = $data2 = array();
foreach ($abc as $key => $value) {
        $v1 = isset($value['a']) ? $value['a'] : 0;
        $v2 = isset($value['b']) ? $value['b'] : 0;
        if ($v1 == 1 && $v2 == 2) {
                $data1[] = $value;
        }
        if ($v1 == 3) {
                $data2[] = $value;
        }   ??
}           
print_r($data1);
            
print_r($data2);

------解决方案--------------------

$abc = array(
    'a1'=>array('a'=>1,'b'=>1,'c'=>1,'d'=>2),
    'a2'=>array('a'=>1,'b'=>2,'c'=>2,'d'=>2),
    'a3'=>array('a'=>3,'b'=>2,'c'=>3,'d'=>2)
);

$n = array();

foreach($abc as $key=>$val){
    if($val['a']==1 && $val['b']==1 
------解决方案--------------------
 $val['a']==3){
        $n = array_merge($n,array_values($val));
    }
}

print_r($n);
?>

Array
(
[0] => 1
[1] => 1
[2] => 1
[3] => 2
[4] => 3
[5] => 2
[6] => 3
[7] => 2
)
------解决方案--------------------

$abc = array(
  'a1' => array('a' => 1, 'b' => 1, 'c' => 1, 'd' => 2),
  'a2' => array('a' => 1, 'b' => 2, 'c' => 2, 'd' => 2),
  'a3' => array('a' => 3, 'b' => 2, 'c' => 3, 'd' => 2),
);
$new_arr1=array();
$new_arr2=array();
$item1=array('a'=>1,'b'=>1);
$item2=array('a'=>3);
foreach($abc as $k=>$v){
    $a=array_intersect_assoc($item1,$v);
    $b=array_intersect_assoc($item2,$v);
    if($a==$item1) $new_arr1=$v;
    if($b==$item2) $new_arr2=$v;
}
print_r(array_merge(array_values($new_arr1),array_values($new_arr2)));