Question

How to check if a key exists in array, but it can be multiple key?
I meant:

$a['b'] = 'Im exists!';
var_dump (isset($a['b']));

but my case is a but complicated:

$a['c'] = 'c';
$a['xxc'] = 'value';
$a[2][4] = 'more complex!';
$a['b']['d']['g'] = 4;

at this point, isset() wont work, but neither array_key_exists. Then how to check, if I want to know if [2][4] exists, or [‘b’][‘d’][‘g’] does?

Answer 1

It was an interesting problem to solve, here you go:

function key_exists_recursive($keys, $array)
{
    if(!is_array($keys) or !is_array($array))
    {
        return false;
    }

    if(count($keys) > 1)
    {
        return key_exists_recursive(array_slice($keys, 1), $array[$keys[0]]);
    }

    return isset($array[$keys[0]]);
}

Usage: key_exists_recursive(array('c'), $a);