PHP array_udiff function

Last Updated: February 15, 2022

array_udiff — Compute the difference of arrays Use callback functions to compare values

Syntax

array_udiff(array $array, array ...$arrays, callable $value_compare_func): array

Supports (PHP 5, PHP 7, PHP 8)

Parameters

Parameter Description
array first array
arrays arrays to compare against
value_compare_func

callback function for values

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 Value

returns an array containing all the values from array that are not present in any of the other arguments

Example

function myValue_function($a,$b)
{
    if ($a===$b)
    {
        return 0;
    }
    return ($a>$b)?1:-1;
}

$a1=array("a"=>"one","b"=>"two","c"=>"three");
$a2=array("a"=>"one","b"=>"three","c"=>"four");

$result=array_udiff($a1,$a2,"myValue_function");
print_r($result);

Output

Array ( [b] => two )
Test