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<?php $a = [1 => 'a', 2=> 'b', 3 => 'c']; $b = [1, 3]; var_dump(array_intersect_ukey($a, $b, function ($item, $c) { var_dump($item); var_dump($c); var_dump('-'); return $item === $c; }));
Output for git.master, git.master_jit, rfc.property-hooks
int(1) int(2) string(1) "-" Deprecated: array_intersect_ukey(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/hfBHB on line 5 int(2) int(1) string(1) "-" int(2) int(3) string(1) "-" int(3) int(2) string(1) "-" int(0) int(1) string(1) "-" int(1) int(0) string(1) "-" int(1) int(0) string(1) "-" int(0) int(1) string(1) "-" int(2) int(1) string(1) "-" int(1) int(2) string(1) "-" array(2) { [1]=> string(1) "a" [2]=> string(1) "b" }

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