Recap - Managing a Simple List

Part of the Fundamentals section of Coddy's PHP journey — lesson 40 of 71.

Challenge

Easy

Build a shopping list from scratch by performing a series of operations.

Read the following inputs:

A string item1 - the first item to add
A string item2 - the second item to add
A string item3 - the third item to add
An integer updateIndex - the index of the item to update
A string newItem - the replacement value for that index
A string extraItem - an additional item to add at the end

Perform the following operations in order:

Start with an empty array called $shoppingList
Add item1, item2, and item3 to the array (in that order)
Print the count of items in the array
Print the first item in the array
Update the element at updateIndex with newItem
Add extraItem to the end of the array
Print the new count of items
Print the last item in the array (use count() to find the last index)
Print the item at updateIndex to confirm the update

Print each result on a separate line.

Example:

If the inputs are Milk, Bread, Eggs, 1, Butter, and Cheese, the output should be:

3
Milk
4
Cheese
Butter

If the inputs are Apple, Banana, Orange, 0, Grape, and Mango, the output should be:

3
Apple
4
Mango
Grape

Try it yourself

<?php
// Read inputs
$item1 = trim(fgets(STDIN));
$item2 = trim(fgets(STDIN));
$item3 = trim(fgets(STDIN));
$updateIndex = intval(trim(fgets(STDIN)));
$newItem = trim(fgets(STDIN));
$extraItem = trim(fgets(STDIN));

// TODO: Write your code below
// 1. Start with an empty array called $shoppingList
// 2. Add item1, item2, and item3 to the array
// 3. Print the count of items
// 4. Print the first item
// 5. Update the element at updateIndex with newItem
// 6. Add extraItem to the end
// 7. Print the new count
// 8. Print the last item (use count() to find the last index)
// 9. Print the item at updateIndex

?>

All lessons in Fundamentals

3Basic Operators

Arithmetic Operators Modulo Operator Exponentiation Operator Combined Assignment Increment/Decrement Operator Precedence Recap - Simple Calculations String Operators

6Arrays Part 1 - Indexed

Introduction to Arrays Creating Indexed Arrays Accessing Elements by Index Modifying Elements by Index Array Size with Count Adding Elements to an ArrayRecap - Managing a Simple List

9Project: Simple To-Do List

Project Overview & Data Adding a New Task

Displaying All Tasks

Marking a Task as Complete

Removing a Task

Filtering by Completion Status

Handling Empty List Scenarios