合并多维数组然后求和值

Question

I have an array with dinamic value like this. the goal is merge array with have same code and sum of value with same code.

$array = array(
    array(
        array(
            'code'=>'AA',
            'name'=>'A Name',
            'cost'=>'10',
        ),
        array(
            'code'=>'AB',
            'name'=>'B Name',
            'cost'=>'15',
        ),
    ),
    array(
        array(
            'code'=>'AA',
            'name'=>'A Name',
            'cost'=>'15',
        ),
        array(
            'code'=>'AB',
            'name'=>'B Name',
            'cost'=>'10',
        ),
        array(
            'code'=>'AC',
            'name'=>'C Name',
            'cost'=>'10',
        ),
    ),
    array(
        array(
            'code'=>'AA',
            'name'=>'A Name',
            'cost'=>'5',
        ),
        array(
            'code'=>'AB',
            'name'=>'B Name',
            'cost'=>'10',
        ),
        array(
            'code'=>'AC',
            'name'=>'C Name',
            'cost'=>'15',
        ),
    ),
);

And i want result like this

$result = array(
    array(
        array(
            'code'=>'AA',
            'name'=>'A Name',
            'cost'=>'30',
        ),
        array(
            'code'=>'AB',
            'name'=>'B Name',
            'cost'=>'35',
        ),
    ),
);

The result is only code AA and BB because code AC not exist on first index. then code the same value to be sum.

Thanks

Answer 1

Demo

$array = array(
            array(
                array(
                    'code'=>'AA',
                    'name'=>'A Name',
                    'cost'=>'10',
                ),
                array(
                    'code'=>'AB',
                    'name'=>'B Name',
                    'cost'=>'15',
                ),
            ),
            array(
                array(
                    'code'=>'AA',
                    'name'=>'A Name',
                    'cost'=>'15',
                ),
                array(
                    'code'=>'AB',
                    'name'=>'B Name',
                    'cost'=>'10',
                ),
                array(
                    'code'=>'AC',
                    'name'=>'C Name',
                    'cost'=>'10',
                ),
            ),
            array(
                array(
                    'code'=>'AA',
                    'name'=>'A Name',
                    'cost'=>'5',
                ),
                array(
                    'code'=>'AB',
                    'name'=>'B Name',
                    'cost'=>'10',
                ),
                array(
                    'code'=>'AC',
                    'name'=>'C Name',
                    'cost'=>'15',
                ),
            ),
        );      

        $the_biggest_number=count($array);

        $new_array = array();
        foreach ($array as $key => $val) {

            foreach ($val as $sub_key => $sub_val) {
                if(!isset($new_array[$sub_val['code']])){
                        $sub_val['count']=1;
                        $new_array[$sub_val['code']]=$sub_val;
                }
                else{
                    $new_array[$sub_val['code']]['cost'] += $sub_val['cost'];
                    $new_array[$sub_val['code']]['count'] += 1;
                }
            }
        }        

        $result=array();
        foreach ($new_array as $key => $val) {
            if($val['count']==$the_biggest_number){
                unset($val['count']);
                $result[]=$val;
            }
        }

        $result= array($result);

        echo '<pre>';
        print_r($result);