Check if array has any keys not in (another) array

Question

This is probably a duplicate but I can't find my answer so...

What is the simplest way to do the following:

$valid_keys = ['a','b','c'];

$my_array = ['a'=>'foo', 'd'=>'bar'];

$my_other_array = ['a'=>'foo', 'b'=>'bar'];

array_has_invalid_keys($my_array, $valid_keys);
> true

array_has_invalid_keys($my_other_array, $valid_keys);
> false

Basically I want to check if my_array has any keys that are not in the valid_keys array

$result = count(array_diff(array_flip($my_array), $valid_keys)) > 0 ? true : false; — jibsteroos
– jibsteroos, Commented Jun 25, 2020 at 22:26

bumperbox · Accepted Answer · 2020-06-25 22:17:12Z

2

<?php
    
$valid_keys = ['a', 'b', 'c'];
$my_array = ['a' => 'foo', 'd' => 'bar'];

$ret = array_has_invalid_keys($my_array, $valid_keys);

var_dump($ret);

function array_has_invalid_keys($my_array, $valid_keys) {
    $keys = array_keys($my_array);
    $invalid_keys = array_diff($keys, $valid_keys);

    return !empty($invalid_keys);
}

answered Jun 25, 2020 at 22:17

bumperbox

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3 Comments

C_Z_ Over a year ago

Won't this also return false if there are any keys in $valid_keys that aren't used in $my_array? I'll edit my question to be more clear, I want more of a 1-way comparison

bumperbox Over a year ago

phpdocs say, array_diff returns an array containing all the entries from array1 that are not present in any of the other arrays.

bumperbox Over a year ago

try it with $my_other_array as per your example, and it will return false

Δ O · Accepted Answer · 2020-06-25 22:13:15Z

0

<?php
$valid_keys = ['a','b','c'];

function array_has_invalid_keys(array $array, array $valid_keys) : bool {
    foreach(array_keys($array) as $k) {
        if (!in_array($k, $valid_keys))
            return true;
    }
    return false;
}

array_has_invalid_keys(['a'=>'foo', 'b'=>'bar'], $valid_keys); // false
array_has_invalid_keys(['a'=>'foo', 'd'=>'bar'], $valid_keys); // true

answered Jun 25, 2020 at 22:13

Δ O

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