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[php5.6] array_keys_exist
if (!function_exists('array_keys_exist')) {
* Checks if given keys or indexes exist in the array.
* @author Ozgur Giritli <>
* @param array $array Array to check keys against.
* @param mixed $keys Key to check existance of.
* @param mixed $keys,... Additional keys to check existance of.
* @return boolean
function array_keys_exist($array, ...$keys) {
return count(array_intersect_key(array_flip($keys), $array)) === count($keys);
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