I find it odd that there is no version of this function which allows you to use a comparator callable in order to determine items equality (like array_udiff and array_uintersect). So, here's my version for you:
<?php
function array_uunique(array $array, callable $comparator): array {
$unique_array = [];
do {
$element = array_shift($array);
$unique_array[] = $element;
$array = array_udiff(
$array,
[$element],
$comparator
);
} while (count($array) > 0);
return $unique_array;
}
?>
And here is a test code:
<?php
class Foo {
public $a;
public function __construct(int $a) {
$this->a = $a;
}
}
$array_of_objects = [new Foo(2), new Foo(1), new Foo(3), new Foo(2), new Foo(2), new Foo(1)];
$comparator = function (Foo $foo1, Foo $foo2): int {
return $foo1->a <=> $foo2->a;
};
var_dump(array_uunique($array_of_objects, $comparator)); ?>
