How to merge two-dimensional arrays into one array according to specified conditions

Merge the data into an array. If the attributes are equal, the quantity and product ID will be increased. Products with different attributes will not be merged.

There are two arrays as follows. Find out how to merge them into one array according to conditions.

<code>$item_1 = array(
[0]=> array(
                'goods_id'=>1,
                'price'=>1,
                'goods_name'=>'商品1',
                'goods_attr_id'=>'1',
                'num'=>1,
        ),
        [1]=> array(
        
                'goods_id'=>2,
                'price'=>10,
                'goods_name'=>'测试商品2',
                'goods_attr_id'=>'3',
                'num'=>2,
        
        ),
        [2]=> array(
        
                'goods_id'=>3,
                'price'=>20,
                'goods_name'=>'测试商品3',
                'goods_attr_id'=>'4',
                'num'=>3,
        
        ),

);

$item_2 = array(

        [0]=> array(
        
                'goods_id'=>1,
                'price'=>1,
                'goods_name'=>'商品1',
                'goods_attr_id'=>'1,2',
                'num'=>1,
        
        ),
        [1]=> array(
        
                'goods_id'=>2,
                'price'=>10,
                'goods_name'=>'测试商品2',
                'goods_attr_id'=>'3',
                'num'=>2,
        
        ),
        [2]=> array(
        
                'goods_id'=>4,
                'price'=>30,
                'goods_name'=>'测试商品4',
                'goods_attr_id'=>'5',
                'num'=>1,
        ),
);</code>

Reply content:

Merge the data into an array. If the attributes are equal, the quantity and product ID will be increased. Products with different attributes will not be merged.

There are two arrays as follows. Find out how to merge them into one array according to conditions.

<code>$item_1 = array(
[0]=> array(
                'goods_id'=>1,
                'price'=>1,
                'goods_name'=>'商品1',
                'goods_attr_id'=>'1',
                'num'=>1,
        ),
        [1]=> array(
        
                'goods_id'=>2,
                'price'=>10,
                'goods_name'=>'测试商品2',
                'goods_attr_id'=>'3',
                'num'=>2,
        
        ),
        [2]=> array(
        
                'goods_id'=>3,
                'price'=>20,
                'goods_name'=>'测试商品3',
                'goods_attr_id'=>'4',
                'num'=>3,
        
        ),

);

$item_2 = array(

        [0]=> array(
        
                'goods_id'=>1,
                'price'=>1,
                'goods_name'=>'商品1',
                'goods_attr_id'=>'1,2',
                'num'=>1,
        
        ),
        [1]=> array(
        
                'goods_id'=>2,
                'price'=>10,
                'goods_name'=>'测试商品2',
                'goods_attr_id'=>'3',
                'num'=>2,
        
        ),
        [2]=> array(
        
                'goods_id'=>4,
                'price'=>30,
                'goods_name'=>'测试商品4',
                'goods_attr_id'=>'5',
                'num'=>1,
        ),
);</code>

<code>foreach ($item_1 as $key => $value) {
    $arr[$value['goods_id'].'_'.$value['goods_attr_id']]=$value;

}

foreach ($item_2 as $key => $value) {
    if(empty($arr[$value['goods_id'].'_'.$value['goods_attr_id']])){
        $arr[$value['goods_id'].'_'.$value['goods_attr_id']]=$value;

    }else{
        $arr[$value['goods_id'].'_'.$value['goods_attr_id']]['num']=$arr[$value['goods_id'].'_'.$value['goods_attr_id']]['num']+$value['num'];
    }
        
}    
var_dump($arr);
</code>

Sort first, put the same ones together, and then count.

It looks like EC. First group them according to goods_id, and then merge them. For specific methods, you can search php array functions. There are many. You can learn their uses by playing with each function of this group and printing it.