We can find the difference between two arrays using the - (subtract) method. This method returns a new array that is a copy of the original array animals1, removing any items that also appear in other array animals2.

{{code:php $animals1 = array('cat', 'dog', 'bat', 'rat'); $animals2 = array('cat', 'dog');

$result = array_diff($animals1, $animals2);
var_export($result);
// => array(2 => 'bat', 3 => 'rat')

}}

{{code:ruby animals1 = ['cat', 'dog', 'bat', 'rat'] animals2 = ['cat', 'dog']

p animals1 - animals2
# => ["bat", "rat"]

}}

{{related: array/array_diff_assoc
array/array_intersect
array/array_intersect_assoc }}