PHP: Computes the difference of two arrays by value, not by key (like array_diff_ukey)

file.php

<?php

function diff($array1, $array2, $compare_func) {
    return array_diff_ukey($array1, $array2, function($key1, $key2) use ($array1, $array2, $compare_func) {
      	if (!isset($array1[$key1])) return 1;
        if (!isset($array2[$key2])) return -1;
        return $compare_func($array1[$key1], $array2[$key2]);
    });
}

sample.php

<?php

$array1 = array(array("id" => 123), array("id" => 42));
$array2 = array(array("id" => 42), array("id" => 1423));

$difference = diff($array1, $array2, function($val1, $val2) {
    //return $val1["id"] <=> $val2["id"]; PHP7
    if ($val1["id"] == $val2["id"])
        return 0;
    else if ($val1["id"] > $val2["id"])
        return 1;
    else
        return -1;
});

var_dump($difference);