How to check if multiple array keys exists

Question

I have a variety of arrays that will either contain

story & message 

or just

story 

How would I check to see if an array contains both story and message? array_key_exists() only looks for that single key in the array.

Is there a way to do this?

Answer 1

Here is a solution that's scalable, even if you want to check for a large number of keys:

<?php  // The values in this arrays contains the names of the indexes (keys)  // that should exist in the data array $required = array('key1', 'key2', 'key3');  $data = array(     'key1' => 10,     'key2' => 20,     'key3' => 30,     'key4' => 40, );  if (count(array_intersect_key(array_flip($required), $data)) === count($required)) {     // All required keys exist! }