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).

index.php:

//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, $new_task); array_unshift($task_list, $new_task); //add the task in first index shifted the array } 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'); ?>

task_list.php:

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:

main.php:

The finished product should resemble the image below with appropriate functionality.

THANK YOU!

Task List Manager Array ([0] Tasks: Hi[1] Hello [2>Write chapter 131> Edit chapter [4] Proofread chapter) 1. Hi 2. Hello 3. Write chapter 4. Edit chapter 5. Proofread chapter Add Task: Task Add Task Select Task: Task: H Modify Task|| Promote Task Delete Task Sort Tasks Task List Manager Array ([0] Tasks: Hi[1] Hello [2>Write chapter 131> Edit chapter [4] Proofread chapter) 1. Hi 2. Hello 3. Write chapter 4. Edit chapter 5. Proofread chapter Add Task: Task Add Task Select Task: Task: H Modify Task|| Promote Task Delete Task Sort Tasks