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--TEST-- Test usort() function : usage variations - multi-dimensional arrays --FILE-- <?php /* Prototype : bool usort(array $array_arg, string $cmp_function) * Description: Sort an array by values using a user-defined comparison function * Source code: ext/standard/array.c */ /* * Pass a multi-dimensional array as $array_arg argument to usort() * to test how array is re-ordered */ echo "*** Testing usort() : usage variation ***\n"; function cmp_function($value1, $value2) { if($value1 == $value2) { return 0; } else if($value1 > $value2) { return 1; } else { return -1; } } $array_args = array( 0 => array(2, 10, -1), 1 => array(100), 2 => array(), 3 => array(0), 4 => array(-1), 5 => array(-9, 34, 54, 0, 20), 6 => array(''), 7 => array("apple", "Apple", "APPLE", "aPPle", "aPpLe") ); $temp_array = $array_args; echo "\n-- Pass usort() a two-dimensional array --\n"; // sorting array_arg as whole array var_dump( usort($temp_array, 'cmp_function') ); echo "-- Array after call to usort() --\n"; var_dump($temp_array); echo "\n-- Pass usort() a sub-array --\n"; var_dump( usort($array_args[5], 'cmp_function') ); echo "-- Array after call to usort() --\n"; var_dump($array_args[5]); ?> ===DONE=== --EXPECTF-- *** Testing usort() : usage variation *** -- Pass usort() a two-dimensional array -- bool(true) -- Array after call to usort() -- array(8) { [0]=> array(0) { } [1]=> array(1) { [0]=> int(-1) } [2]=> array(1) { [0]=> string(0) "" } [3]=> array(1) { [0]=> int(0) } [4]=> array(1) { [0]=> int(100) } [5]=> array(3) { [0]=> int(2) [1]=> int(10) [2]=> int(-1) } [6]=> array(5) { [0]=> int(-9) [1]=> int(34) [2]=> int(54) [3]=> int(0) [4]=> int(20) } [7]=> array(5) { [0]=> string(5) "apple" [1]=> string(5) "Apple" [2]=> string(5) "APPLE" [3]=> string(5) "aPPle" [4]=> string(5) "aPpLe" } } -- Pass usort() a sub-array -- bool(true) -- Array after call to usort() -- array(5) { [0]=> int(-9) [1]=> int(0) [2]=> int(20) [3]=> int(34) [4]=> int(54) } ===DONE===