Case conversion functions in PHP - Mini Project: Build & Apply

Case conversion functions

📖 Scenario: You are working on a simple text processing tool that changes the case of words. This is useful when you want to standardize names or titles in a list.

🎯 Goal: Build a PHP script that converts a list of words to uppercase, lowercase, and capitalized forms using PHP's case conversion functions.

📋 What You'll Learn

Create an array of words with exact values

Create a variable to hold the number of words

Use a for loop to convert each word to uppercase and store in a new array

Print the original array and the uppercase array

💡 Why This Matters

🌍 Real World

Changing the case of text is common in data cleaning, formatting user input, or preparing text for display.

💼 Career

Many programming jobs require manipulating strings and arrays, especially for web development and data processing.

1

Create the initial array of words

Create an array called words with these exact values: 'apple', 'Banana', 'Cherry', 'date', 'Elderberry'.

PHP

# Create the array called words with the given values
# Your code here

Need a hint?

Use $words = [ ... ]; to create the array with the exact words.

2

Create a variable for the number of words

Create a variable called count and set it to the number of elements in the $words array using the count() function.

PHP

<?php
$words = ['apple', 'Banana', 'Cherry', 'date', 'Elderberry'];
# Create the variable count with the number of words
# Your code here

Need a hint?

Use count($words) to get the number of words.

3

Convert words to uppercase using a for loop

Create an empty array called upperWords. Use a for loop with the variable i from 0 to $count - 1. Inside the loop, convert $words[i] to uppercase using strtoupper() and store it in upperWords[i].

PHP

<?php
$words = ['apple', 'Banana', 'Cherry', 'date', 'Elderberry'];
$count = count($words);
# Create upperWords array and fill it with uppercase words using a for loop
# Your code here

Need a hint?

Use strtoupper() to convert each word to uppercase inside the loop.

4

Print the original and uppercase arrays

Use print_r() to print the $words array with the label "Original words:". Then print the $upperWords array with the label "Uppercase words:".

PHP

<?php
$words = ['apple', 'Banana', 'Cherry', 'date', 'Elderberry'];
$count = count($words);
$upperWords = [];
for ($i = 0; $i < $count; $i++) {
    $upperWords[$i] = strtoupper($words[$i]);
}
# Print the original and uppercase arrays
# Your code here

Need a hint?

Use print_r() to display arrays with labels.