$_SERVER information in PHP - Mini Project: Build & Apply

Exploring $_SERVER Information in PHP

📋 What You'll Learn

💡 Why This Matters

🌍 Real World

Web developers often need to check server environment details to debug or customize website behavior based on server or client information.

💼 Career

Understanding $_SERVER helps in backend web development, troubleshooting server issues, and writing dynamic PHP applications that respond to request details.

1

Create the initial $_SERVER keys list

Create a variable called keys_to_show and set it to an array with these exact strings: 'SERVER_NAME', 'SERVER_SOFTWARE', 'REQUEST_METHOD', 'SCRIPT_NAME', 'HTTP_USER_AGENT'.

PHP

# Create the array keys_to_show with the specified $_SERVER keys
# Your code here

Need a hint?

Use square brackets [] to create an array with the exact keys listed.

2

Initialize the server_info array

Create an empty associative array called server_info to hold the selected $_SERVER information.

PHP

<?php
$keys_to_show = ['SERVER_NAME', 'SERVER_SOFTWARE', 'REQUEST_METHOD', 'SCRIPT_NAME', 'HTTP_USER_AGENT'];

# Create an empty array called server_info
# Your code here

Need a hint?

Use = [] to create an empty array.

3

Fill server_info with selected $_SERVER data

Use a foreach loop with variable key to iterate over keys_to_show. Inside the loop, set server_info[key] to the value from $_SERVER[key] if it exists, or to the string 'Not set' if it does not.

PHP

<?php
$keys_to_show = ['SERVER_NAME', 'SERVER_SOFTWARE', 'REQUEST_METHOD', 'SCRIPT_NAME', 'HTTP_USER_AGENT'];

$server_info = [];

# Use foreach to fill server_info with $_SERVER values or 'Not set'
# Your code here

Need a hint?

Use the null coalescing operator ?? to provide a default value if the $_SERVER key is missing.

4

Print the server_info contents

Use a foreach loop with variables key and value to iterate over server_info. Inside the loop, print each key and value in the format: key: value followed by a newline.

PHP

<?php
$keys_to_show = ['SERVER_NAME', 'SERVER_SOFTWARE', 'REQUEST_METHOD', 'SCRIPT_NAME', 'HTTP_USER_AGENT'];

$server_info = [];

foreach ($keys_to_show as $key) {
    $server_info[$key] = $_SERVER[$key] ?? 'Not set';
}

# Print each key and value from server_info
# Your code here

Need a hint?

Use echo to print each key and value with a colon and newline.