求高效率算法，合并多个多维数组值

求高效算法，合并多个多维数组值
例如
$a = array(
array(
'province'=>'ss',
'package' => array(
array(
'FX58'=>0,
'PName' => 'a'
),
),
'storeName'=> 'test',
),
array(
'province'=>'cc',
'package' => array(
array(
'FX58'=>1,
'PName' => 'b'
),
),
'storeName'=> 'test2',
)
);
$b = array(
array(
'province'=>'ss',
'package' => array(
array(
'FX58'=>1,
'PName' => 'a'
),
),
'storeName'=> 'test',
),
array(
'province'=>'cc',
'package' => array(
array(
'FX58'=>2,
'PName' => 'b'
),
),
'storeName'=> 'test2',
)
);
将b数组值统计到a数组中
------解决思路----------------------

$a = array(
  array(
    'province'=>'ss',
    'package' => array(
      array(
        'FX58'=>0,
        'PName' => 'a'
      ),
    ),
    'storeName'=> 'test',
  ),
  array(
    'province'=>'cc',
    'package' => array(
      array(
        'FX58'=>1,
        'PName' => 'b'
      ),
    ),
    'storeName'=> 'test2',
  )
);
$b = array(
  array(
    'province'=>'ss',
    'package' => array(
      array(
        'FX58'=>1,
        'PName' => 'a'
      ),
    ),
    'storeName'=> 'test',
  ),
  array(
    'province'=>'cc',
    'package' => array(
      array(
        'FX58'=>2,
        'PName' => 'b'
      ),
    ),
    'storeName'=> 'test2',
  )
);

foreach($a as $v) {
  foreach($v['package'] as $t) {
    $res[$v['province']][$v['storeName']][$t['PName']] = $t['FX58'];
  }
}
foreach($b as &$v) {
  foreach($v['package'] as $t) {
    $res[$v['province']][$v['storeName']][$t['PName']] += $t['FX58'];
  }
}
foreach($a as &$v) {
  foreach($v['package'] as &$t) {
    $t['FX58'] = $res[$v['province']][$v['storeName']][$t['PName']];
  }
}

print_r($a);

Array
(
    [0] => Array
        (
            [province] => ss
            [package] => Array
                (
                    [0] => Array
                        (
                            [FX58] => 1
                            [PName] => a
                        )

                )

            [storeName] => test
        )

    [1] => Array
        (
            [province] => cc
            [package] => Array
                (
                    [0] => Array
                        (
                            [FX58] => 3
                            [PName] => b
                        )

                )

            [storeName] => test2
        )

)

$a = array(
  array(
    'province'=>'ss',
    'package' => array(
      array(
        'FX58'=>0,
        'PName' => 'a'
      ),
    ),
    'storeName'=> 'test',
  ),
  array(
    'province'=>'cc',
    'package' => array(
      array(
        'FX58'=>1,
        'PName' => 'b'
      ),
    ),
    'storeName'=> 'test2',
  )
);
$b = array(
  array(
    'province'=>'ss',
    'package' => array(
      array(
        'FX58'=>1,
        'PName' => 'a'
      ),
    ),
    'storeName'=> 'test',
  ),
  array(
    'province'=>'cc',
    'package' => array(
      array(
        'FX58'=>2,
        'PName' => 'b'
      ),
    ),
    'storeName'=> 'test2',
  )
);


foreach($b as $k=>$v){
	for($i=0,$len=count($a); $i		if($a[$i]['province'] == $v['province'] && $a[$i]['package'][0]['PName']==$v['package'][0]['PName'] && $a[$i]['storeName']==$v['storeName']){
			$a[$i]['package'][0]['FX58'] += $v['package'][0]['FX58'];
		}
	}
}

echo '
';
print_r($a);
echo '
';

Array
(
    [0] => Array
        (
            [province] => ss
            [package] => Array
                (
                    [0] => Array
                        (
                            [FX58] => 1
                            [PName] => a
                        )

                )

            [storeName] => test
        )

    [1] => Array
        (
            [province] => cc
            [package] => Array
                (
                    [0] => Array
                        (
                            [FX58] => 3
                            [PName] => b
                        )

                )

            [storeName] => test2
        )

)