Merging two multidimensional arrays on specific key

Question

Let\'s say I have following arrays:

Array
    (
        [0] => Array
            (
                [id] => 5
                [name] => Education
            


        

Answer 1

As long as both arrays always have every id in them, what about sorting the two arrays by that 'id' field, then letting php do the merge?

function cmp($a, $b) {
  return ((int) $a['id'] < (int) $b['id']) ? -1 : 1;
}

usort($array1, 'cmp');
usort($array2, 'cmp');

$result = array_merge($array1, $array2);

Have not tested the code, but it demonstrates the idea.