The array_udiff() function compares array values in a user-made function. It returns an array containing all the values of the first array that are not present in any of the other parameters.
Syntax
array_udiff(arr1, arr2, arr3, … , compare_func)
Parameters
arr1 − The first array to compare from.
arr2 − The second array to be compared with.
arr3 − More arrays to compare.
compare_func − The comparison function. It must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
Return
The array_udiff() function returns an array containing all the values of the first array that are not present in any of the other parameters.
Example
The following is an example −
<?php
function compare_func($a, $b) {
if ($a === $b) {
return 0;
}
return ($a > $b)? 1:-1;
}
$arr1 = array("a" => "laptop", "b" => "keyboard", "c" => "mouse");
$arr2 = array("a" => "laptop", "d" => "mouse");
$res = array_udiff($arr1, $arr2, "compare_func");
print_r($res);
?>Output
Array ( [b] => keyboard )