How to merge multidimensional arrays while preserving keys?

Question

Is there a way for these arrays

$array1 = array(
    \'21-24\' => array(
        \'1\' => array(\"...\")
    )
);

$array2 = array(
    \'21-24\' =>         


        

Answer 1

Have you considered array_replace_recursive()?

print_r(array_replace_recursive($array1, $array2, $array3, $array4));