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--TEST-- Test uasort() function : usage variations - different associative arrays --FILE-- <?php /* Prototype : bool uasort(array $array_arg, string $cmp_function) * Description: Sort an array with a user-defined comparison function and maintain index association * Source code: ext/standard/array.c */ /* Testing uasort() with different associative arrays having keys as * string, integer, default & duplicate keys */ echo "*** Testing uasort() : sorting different associative arrays ***\n"; // comparison function /* Prototype : int cmp(mixed $value1, mixed $value2) * Parameters : $value1 and $value2 - values to be compared * Return value : 0 - if both values are same * 1 - if value1 is greater than value2 * -1 - if value1 is less than value2 * Description : compares value1 and value2 */ function cmp($value1, $value2) { if($value1 == $value2) { return 0; } else if($value1 > $value2) { return 1; } else return -1; } // Array with duplicate string and integer keys $array_arg = array(0 => 2, "a" => 8, "d" => 9, 3 => 3, 5 => 2, "o" => 6, "z" => -99, 0 => 1, "z" => 3); echo "-- Array with duplicate keys --\n"; var_dump( uasort($array_arg, 'cmp') ); var_dump($array_arg); // Array with default and assigned keys $array_arg = array(0 => "Banana", 1 => "Mango", "Orange", 2 => "Apple", "Pineapple"); echo "-- Array with default/assigned keys --\n"; var_dump( uasort($array_arg, 'cmp') ); var_dump($array_arg); echo "Done" ?> --EXPECTF-- *** Testing uasort() : sorting different associative arrays *** -- Array with duplicate keys -- bool(true) array(7) { [0]=> int(1) [5]=> int(2) ["z"]=> int(3) [3]=> int(3) ["o"]=> int(6) ["a"]=> int(8) ["d"]=> int(9) } -- Array with default/assigned keys -- bool(true) array(4) { [2]=> string(5) "Apple" [0]=> string(6) "Banana" [1]=> string(5) "Mango" [3]=> string(9) "Pineapple" } Done