--TEST-- Test array_diff_assoc() function : usage variations - strict string comparison check --FILE-- <?php /* Prototype : array array_diff_assoc(array $arr1, array $arr2 [, array ...]) * Description: Returns the entries of $arr1 that have values which are not * present in any of the others arguments but do additional checks whether the keys are equal * Source code: ext/standard/array.c */ /* * Test how array_diff_assoc behaves * 1. When comparing an array that has similar elements * but has been created in a different order * 2. When doing a strict comparison of string representation */ echo "*** Testing array_diff_assoc() : usage variations ***\n"; $array = array ('zero', 1 => 1, 'two' => 2.00000000000001); $inputs = array ( //default keys => string values /*1*/ array('2.00000000000001', '1', 'zero', 'a'), //numeric keys => string values /*2*/ array(2 => '2.00000000000001', 1 => '1', 0 => 'zero', 3 => 'a'), //string keys => string values /*3*/ array('2' => '2.00000000000001', '1' => '1', '0' => 'zero', '3' => 'a') , //default keys => numeric values /*4*/ array(2, 1, 0), //numeric keys => numeric values /*5*/ array(2 => 2, 1 => 1, 0 => 0), //string keys => numeric values /*6*/ array('two' => 2, '1' => 1, '0' => 0), //defualt keys => float values /*7*/ array(2.00000000000001, 1.00, 0.01E-9), //numeric keys => float values /*8*/ array(2 => 2.00000000000001, 1 => 1.00, 0 => 0.01E-9), //string keys => float values /*9*/ array ('two' => 2.00000000000001, '1' => 1.00, '0' =>0.01E-9) ); // loop through each element of $inputs to check the behavior of array_diff_assoc $iterator = 1; foreach($inputs as $input) { echo "\n-- Iteration $iterator --\n"; var_dump(array_diff_assoc($array, $input)); var_dump(array_diff_assoc($input, $array)); $iterator++; }; echo "Done"; ?> --EXPECTF-- *** Testing array_diff_assoc() : usage variations *** -- Iteration 1 -- array(2) { [0]=> string(4) "zero" ["two"]=> float(2) } array(3) { [0]=> string(16) "2.00000000000001" [2]=> string(4) "zero" [3]=> string(1) "a" } -- Iteration 2 -- array(1) { ["two"]=> float(2) } array(2) { [2]=> string(16) "2.00000000000001" [3]=> string(1) "a" } -- Iteration 3 -- array(1) { ["two"]=> float(2) } array(2) { [2]=> string(16) "2.00000000000001" [3]=> string(1) "a" } -- Iteration 4 -- array(2) { [0]=> string(4) "zero" ["two"]=> float(2) } array(2) { [0]=> int(2) [2]=> int(0) } -- Iteration 5 -- array(2) { [0]=> string(4) "zero" ["two"]=> float(2) } array(2) { [2]=> int(2) [0]=> int(0) } -- Iteration 6 -- array(1) { [0]=> string(4) "zero" } array(1) { [0]=> int(0) } -- Iteration 7 -- array(2) { [0]=> string(4) "zero" ["two"]=> float(2) } array(2) { [0]=> float(2) [2]=> float(1.0E-11) } -- Iteration 8 -- array(2) { [0]=> string(4) "zero" ["two"]=> float(2) } array(2) { [2]=> float(2) [0]=> float(1.0E-11) } -- Iteration 9 -- array(1) { [0]=> string(4) "zero" } array(1) { [0]=> float(1.0E-11) } Done