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<?php function value_compare_func($a, $b){ var_dump($a, $b); if ($a === 'n_3') { return 0; } return 1; } $array1 = array("n_1", "n_2", "n_3", "n_4" ); $array2 = array("green"); $result = array_udiff($array1, $array2, "value_compare_func"); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "n_1" string(3) "n_2" string(3) "n_3" string(3) "n_2" string(3) "n_1" string(3) "n_4" string(3) "n_2" string(3) "n_4" string(3) "n_3" string(3) "n_4" string(3) "n_3" string(5) "green" string(3) "n_3" string(3) "n_4" string(3) "n_4" string(3) "n_2" string(3) "n_2" string(3) "n_1" Array ( [0] => n_1 [1] => n_2 )

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