Work with the arrays of the Task List Manager application After the Add Task button in the Add Task portion of the page, add a Remove Taskbutton. Then, modify the PHP for the page so the Add Task button adds the task to the top of the task list, and the Remove Task button removes the task at the top of the list (LIFO).

Here is the index.php code :

//get action variable from POST $action = filter_input(INPUT_POST, 'action');

//initialize error messages array $errors = array();

//process switch( $action ) { case 'Add Task': $new_task = filter_input(INPUT_POST, 'newtask'); if (empty($new_task)) { $errors[] = 'The new task cannot be empty.'; } else { // $task_list[] = $new_task; array_push($task_list, $new_task); } break; case 'Delete Task': $task_index = filter_input(INPUT_POST, 'taskid', FILTER_VALIDATE_INT); if ($task_index === NULL || $task_index === FALSE) { $errors[] = 'The task cannot be deleted.'; } else { unset($task_list[$task_index]); $task_list = array_values($task_list); } break; case 'Modify Task': $task_index = filter_input(INPUT_POST, 'taskid', FILTER_VALIDATE_INT); if ($task_index === NULL || $task_index === FALSE) { $errors[] = 'The task cannot be modified.'; } else { $task_to_modify = $task_list[$task_index]; } break; case 'Save Changes': $i = filter_input(INPUT_POST, 'modifiedtaskid', FILTER_VALIDATE_INT); $modified_task = filter_input(INPUT_POST, 'modifiedtask'); if (empty($modified_task)) { $errors[] = 'The modified task cannot be empty.'; } elseif($i === NULL || $i === FALSE) { $errors[] = 'The task cannot be modified.'; } else { $task_list[$i] = $modified_task; $modified_task = ''; } break; case 'Cancel Changes': $modified_task = ''; break; case 'Promote Task': $task_index = filter_input(INPUT_POST, 'taskid', FILTER_VALIDATE_INT); if ($task_index === NULL || $task_index === FALSE) { $errors[] = 'The task cannot be promoted.'; } elseif ($task_index == 0) { $errors[] = 'You can\'t promote the first task.'; } else { // get the values for the two indexes $task_value = $task_list[$task_index]; $prior_task_value = $task_list[$task_index-1];

// swap the values $task_list[$task_index-1] = $task_value; $task_list[$task_index] = $prior_task_value; break; } case 'Sort Tasks': sort($task_list); break; }

include('task_list.php'); ?>

And here is the task_list.php code :

Task List Manager

0) : ?>

Errors:

Tasks:

There are no tasks in the task list.

$task ) : ?>

Add Task:

Task:

0 && empty($task_to_modify)) : ?>

Select Task:

Task: $task ) : ?>

Task to Modify:

Task: