Check if a “run-time” multidimensional array key exists

Question

I have a multidimensional array. I need a function that checks if a specified key exists.

Let\'s take this array

$config[\'lib\'][\'template\'][\'eng         


        

Answer 1

function checkKey($array) {
  $args = func_get_args();
  for ($i = 1; $i < count($args); $i++) {
    if (!isset($array[$args[$i]]))
       return false;
    $array = &$array[$args[$i]];
  }
  return true;
}

Usage:

checkKey($config, 'lib', 'template', 'engine');
checkKey($config, 'genericSetting');