<?php declare(strict_types=1); error_reporting(-1); ini_set('display_errors', 'On'); class Foo { public $id; public function __construct($id) { $this->id = $id; } } $foos = [new Foo(1), new Foo(2), new Foo(3), new Foo(4)]; $fooIds = [1, 2, 3, 4]; $diff = array_udiff($foos, $fooIds, function ($a, $b) { echo gettype($a), ' <=> ', gettype($b), "\n"; if ($a instanceof Foo && $b instanceof Foo) { return $a->id <=> $b->id; } if ($a instanceof Foo) { return $a->id <=> $b; } if ($b instanceof Foo) { return $a <=> $b->id; } return $a <=> $b; }); print_r($diff); // expected result: an empty array
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