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run code in 300+ PHP versions simultaneously
<?php class Profile { public $n; }; $p1 = new Profile(); $p1->n = "Profile #1"; $p2 = new Profile(); $p2->n = "Profile #2"; $p3 = new Profile(); $p3->n = "Profile #3"; $a1 = array($p1, $p2); $a2 = array($p2, $p3); var_dump(array_udiff($a1, $a2, function ($a, $b) { return $a === $b ? 0 : 1; }));
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) { [0]=> object(Profile)#1 (1) { ["n"]=> string(10) "Profile #1" } }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
array(2) { [0]=> object(Profile)#1 (1) { ["n"]=> string(10) "Profile #1" } [1]=> object(Profile)#2 (1) { ["n"]=> string(10) "Profile #2" } }

preferences:
243.3 ms | 402 KiB | 327 Q