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<?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, $b) { var_dump($a->n, $b->n, $a === $b); return $a === $b ? 0 : 1; })); var_dump(array_udiff($a1, $a2, function ($a, $b) { var_dump($a->n, $b->n, $a === $b); if ($a === $b) return 0; return $a > $b ? 1 : -1;}));
Output for 7.0.0 - 7.0.20, 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
string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #2" string(10) "Profile #3" bool(false) string(10) "Profile #2" string(10) "Profile #3" bool(false) string(10) "Profile #2" string(10) "Profile #2" bool(true) string(10) "Profile #2" string(10) "Profile #1" bool(false) array(1) { [0]=> object(Profile)#1 (1) { ["n"]=> string(10) "Profile #1" } } string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #2" string(10) "Profile #3" bool(false) string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #2" string(10) "Profile #2" bool(true) array(1) { [0]=> object(Profile)#1 (1) { ["n"]=> string(10) "Profile #1" } }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
string(10) "Profile #2" string(10) "Profile #1" bool(false) string(10) "Profile #3" string(10) "Profile #2" bool(false) string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #1" string(10) "Profile #3" bool(false) string(10) "Profile #1" string(10) "Profile #2" bool(false) array(2) { [0]=> object(Profile)#1 (1) { ["n"]=> string(10) "Profile #1" } [1]=> object(Profile)#2 (1) { ["n"]=> string(10) "Profile #2" } } string(10) "Profile #2" string(10) "Profile #1" bool(false) string(10) "Profile #3" string(10) "Profile #2" bool(false) string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #1" string(10) "Profile #2" bool(false) string(10) "Profile #2" string(10) "Profile #2" bool(true) array(1) { [0]=> object(Profile)#1 (1) { ["n"]=> string(10) "Profile #1" } }

preferences:
203.57 ms | 403 KiB | 229 Q