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<?php function key_compare_func($a, $b) { var_dump($a, $b); if ($a === $b) { return 0; } return ($a > $b)? 1:-1; } $array1 = array("a" => "green", "b" => "brown", "c" => "red"); $array2 = array("a" => "green", "yellow", "red"); $result = array_diff_ukey($array1, $array2, "key_compare_func"); die; print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "a" string(1) "b" string(1) "b" string(1) "c" string(1) "a" int(0) int(1) int(0) string(1) "a" int(1) string(1) "a" int(0) string(1) "a" int(1) string(1) "a" string(1) "a" string(1) "b" int(0) string(1) "b" int(1) string(1) "b" string(1) "a" string(1) "c" int(0) string(1) "c" int(1) string(1) "c" string(1) "a"

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