Compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.
The array to compare from
An array to compare against
More arrays to compare against
Returns an array containing all the entries from array1 that are not present in any of the other arrays.
The two keys from the
key => value pairs are
considered equal only if
(string) $key1 === (string) $key2 . In other words
a strict type check is executed so the string representation must be
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
The above example will output:
This function only checks one dimension of a n-dimensional
array. Of course you can check deeper dimensions by using