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How to check if multiple array keys exists

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?

Solution

  • If you only have 2 keys to check (like in the original question), it's probably easy enough to just call array_key_exists() twice to check if the keys exists.

    if (array_key_exists("story", $arr) && array_key_exists("message", $arr)) {
    // Both keys exist.
}

    However this obviously doesn't scale up well to many keys. In that situation a custom function would help.

    function array_keys_exists(array $keys, array $arr) {
   return !array_diff_key(array_flip($keys), $arr);
}