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<?php function compare($a, $b) { $ret = value_compare_func($a, $b); echo "value_compare_func($a, $b) == $ret\n"; return $ret; } function value_compare_func($a, $b){ if ($a === 'n_3') { return 0; } return strcmp($a, $b); } $array1 = array("n_1", "n_2", "n_3", "n_4" ); $array2 = array("green"); $result = array_udiff($array1, $array2, "compare"); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
value_compare_func(n_1, n_2) == -1 value_compare_func(n_2, n_3) == -1 value_compare_func(n_3, n_4) == 0 value_compare_func(n_1, green) == 453836 value_compare_func(n_1, n_2) == -1 value_compare_func(n_2, n_3) == -1 value_compare_func(n_3, n_4) == 0 Array ( [0] => n_1 [1] => n_2 [2] => n_3 [3] => n_4 )

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