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

$a1 = array("a" => "red", "b" => "green", "c" => "blue");
$a2 = array("a" => "blue", "b" => "black", "e" => "blue");

$result = array_uintersect($a1, $a2, "myfunction");
print_r($result);
?>

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");

print_r(array_uintersect($array1, $array2, "strcasecmp"));
?>