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--TEST-- Test array_walk() function : usage variations - different callback functions --FILE-- <?php /* Prototype : bool array_walk(array $input, string $funcname [, mixed $userdata]) * Description: Apply a user function to every member of an array * Source code: ext/standard/array.c */ /* * Passing different types of callback functions to array_walk() * without parameters * with less and more parameters */ echo "*** Testing array_walk() : callback function variation ***\n"; $input = array('Apple', 'Banana', 'Mango', 'Orange'); echo "-- callback function with both parameters --\n"; function callback_two_parameter($value, $key) { // dump the arguments to check that they are passed // with proper type var_dump($key); // key var_dump($value); // value echo "\n"; // new line to separate the output between each element } var_dump( array_walk($input, 'callback_two_parameter')); echo "-- callback function with only one parameter --\n"; function callback_one_parameter($value) { // dump the arguments to check that they are passed // with proper type var_dump($value); // value echo "\n"; // new line to separate the output between each element } var_dump( array_walk($input, 'callback_one_parameter')); echo "-- callback function without parameters --\n"; function callback_no_parameter() { echo "callback3() called\n"; } var_dump( array_walk($input, 'callback_no_parameter')); echo "-- passing one more parameter to function with two parameters --\n"; var_dump( array_walk($input, 'callback_two_parameter', 10)); echo "Done" ?> --EXPECTF-- *** Testing array_walk() : callback function variation *** -- callback function with both parameters -- int(0) string(5) "Apple" int(1) string(6) "Banana" int(2) string(5) "Mango" int(3) string(6) "Orange" bool(true) -- callback function with only one parameter -- string(5) "Apple" string(6) "Banana" string(5) "Mango" string(6) "Orange" bool(true) -- callback function without parameters -- callback3() called callback3() called callback3() called callback3() called bool(true) -- passing one more parameter to function with two parameters -- int(0) string(5) "Apple" int(1) string(6) "Banana" int(2) string(5) "Mango" int(3) string(6) "Orange" bool(true) Done