在数组php中累积

Question

我有一个多维的数组

Array ( 
    [0] => Array ( [id] => 2 [id_product_attribute] => 9 ) 
    [1] => Array ( [id] => 2 [id_product_attribute] => 10 ) 
    [2] => Array ( [id] => 2 [id_product_attribute] => 8 ) 
    [3] => Array ( [id] => 3 [id_product_attribute] => 50 ) 
)

我想将此数组转换为此格式

Array ( 
    [0] => Array ( [id] => 2 [id_product_attribute] => Array(9,10,8) ) 
    [1] => Array ( [id] => 3 [id_product_attribute] => Array (50) )
)

Answer 1

循环遍历第一个数组并将值合并到第二个数组中，然后使用array_values来排序第一个数组：（Sandbox）

$orig = array( 
    0 => array( 'id' => 2, 'id_product_attribute' => 9 ),
    1 => array( 'id' => 2, 'id_product_attribute' => 10 ),
    2 => array( 'id' => 2, 'id_product_attribute' => 8 ),
    3 => array( 'id' => 3, 'id_product_attribute' => 50 )
);

$array = [];
foreach ($orig as $o) {
    if (!isset($array[$o['id']])) {
        $array[$o['id']] = ['id' => $o['id'], 'id_product_attribute' => []];
    }

    $array[$o['id']]['id_product_attribute'][] = $o['id_product_attribute'];
}

// to get the first array with indexes 0,1...
$result = array_values($array);

print_r($result);