Compact and extract functions in PHP - Mini Project: Build & Apply

Using Compact and Extract Functions in PHP

📖 Scenario: You are building a simple PHP script to manage user information. You want to group user details into an array easily and then extract them back into variables for use.

🎯 Goal: Learn how to use the compact function to create an array from variables and the extract function to convert array keys back into variables.

📋 What You'll Learn

Create variables with exact names and values as specified

Use compact to create an array from these variables

Use extract to convert the array back into variables

Print the extracted variables exactly as instructed

💡 Why This Matters

🌍 Real World

Grouping related data into arrays and extracting them as variables is common in PHP web development, especially when handling form data or database results.

💼 Career

Understanding <code>compact</code> and <code>extract</code> helps in reading and writing clean PHP code, useful for backend web developer roles.

1

Create user variables

Create three variables: $name with value "Alice", $age with value 30, and $city with value "New York".

PHP

# Your code here

Need a hint?

Use the = operator to assign values to variables.

2

Create an array using compact

Use the compact function to create an array called $userInfo from the variables $name, $age, and $city.

PHP

<?php
$name = "Alice";
$age = 30;
$city = "New York";
# Your code here

Need a hint?

Pass the variable names as strings to compact.

3

Extract variables from the array

Use the extract function to create variables from the $userInfo array.

PHP

<?php
$name = "Alice";
$age = 30;
$city = "New York";
$userInfo = compact('name', 'age', 'city');
# Your code here

Need a hint?

Call extract with the array variable as the argument.

4

Print the extracted variables

Print the variables $name, $age, and $city separated by commas using echo.

PHP

<?php
$name = "Alice";
$age = 30;
$city = "New York";
$userInfo = compact('name', 'age', 'city');
extract($userInfo);
# Your code here

Need a hint?

Use double quotes in echo to include variables directly.