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--TEST-- Test rsort() function : usage variations - multi-dimensional arrays --FILE-- <?php /* Prototype : bool rsort(array &$array_arg [, int $sort_flags]) * Description: Sort an array in reverse order * Source code: ext/standard/array.c */ /* * Pass rsort() multi-dimensional arrays to test behaviour */ echo "*** Testing rsort() : variation ***\n"; // array of arrays $various_arrays = array ( // null array array(), // array contains null sub array array( array() ), // array of arrays along with some values array(44, 11, array(64, 61) ), // array containing sub arrays array(array(33, -5, 6), array(11), array(22, -55), array() ) ); $count = 1; // loop through to test rsort() with different arrays foreach ($various_arrays as $array) { echo "\n-- Iteration $count --\n"; echo "\n-- 'flag' value is default --\n"; $temp_array = $array; var_dump(rsort($temp_array) ); var_dump($temp_array); echo "\n-- 'flag' value is SORT_REGULAR --\n"; $temp_array = $array; var_dump(rsort($temp_array, SORT_REGULAR) ); var_dump($temp_array); $count++; } echo "Done"; ?> --EXPECTF-- *** Testing rsort() : variation *** -- Iteration 1 -- -- 'flag' value is default -- bool(true) array(0) { } -- 'flag' value is SORT_REGULAR -- bool(true) array(0) { } -- Iteration 2 -- -- 'flag' value is default -- bool(true) array(1) { [0]=> array(0) { } } -- 'flag' value is SORT_REGULAR -- bool(true) array(1) { [0]=> array(0) { } } -- Iteration 3 -- -- 'flag' value is default -- bool(true) array(3) { [0]=> array(2) { [0]=> int(64) [1]=> int(61) } [1]=> int(44) [2]=> int(11) } -- 'flag' value is SORT_REGULAR -- bool(true) array(3) { [0]=> array(2) { [0]=> int(64) [1]=> int(61) } [1]=> int(44) [2]=> int(11) } -- Iteration 4 -- -- 'flag' value is default -- bool(true) array(4) { [0]=> array(3) { [0]=> int(33) [1]=> int(-5) [2]=> int(6) } [1]=> array(2) { [0]=> int(22) [1]=> int(-55) } [2]=> array(1) { [0]=> int(11) } [3]=> array(0) { } } -- 'flag' value is SORT_REGULAR -- bool(true) array(4) { [0]=> array(3) { [0]=> int(33) [1]=> int(-5) [2]=> int(6) } [1]=> array(2) { [0]=> int(22) [1]=> int(-55) } [2]=> array(1) { [0]=> int(11) } [3]=> array(0) { } } Done