How can I merge PHP arrays?

Question

I have two arrays of animals (for example).

$array = array(
    array(
        \'id\' => 1,
        \'name\' => \'Cat\',
    ),
    array(
        \'id         


        

Answer 1

foreach ($array as $a)
    $new_array[$a['id']]['name'] = $a['name'];

foreach ($array2 as $a)
    $new_array[$a['id']]['age'] = $a['age'];

and this is result:

    [1] => Array
        (
            [name] => Cat
            [age] => 123
        )

    [2] => Array
        (
            [name] => Mouse
            [age] => 321
        )