Global namespace access in PHP - Mini Project: Build & Apply

Global Namespace Access in PHP

📖 Scenario: Imagine you are writing a PHP script that uses a function named strlen to find the length of a string. However, you also have a custom function named strlen inside a namespace. You want to use the original PHP strlen function from the global namespace.

🎯 Goal: You will create a namespaced function with the same name as a global PHP function, then learn how to call the global function explicitly using the global namespace access.

📋 What You'll Learn

Create a namespace called MyApp

Inside MyApp, create a function called strlen that returns a fixed number

Create a variable $text with the value 'Hello'

Call the global strlen function on $text using global namespace access

Print the result of the global strlen function call

💡 Why This Matters

🌍 Real World

Namespaces help organize code and avoid name conflicts in large PHP projects.

💼 Career

Understanding namespaces and global namespace access is important for working with modern PHP frameworks and libraries.

1

Create a namespace and a custom strlen function

Create a namespace called MyApp. Inside it, define a function called strlen that takes one parameter $str and returns the number 42.

PHP

<?php

namespace MyApp {
    // Your code here
}

Need a hint?

Use the namespace keyword to create a namespace. Define the function inside curly braces.

2

Create a variable with a string value

Outside the MyApp namespace, create a variable called $text and set it to the string 'Hello'.

PHP

<?php

namespace MyApp {
    function strlen($str) {
        return 42;
    }
}

// Your code here

Need a hint?

Just create a variable $text and assign the string 'Hello' to it.

3

Call the global strlen function using global namespace access

Create a variable called $length and set it to the result of calling the global strlen function on $text using the global namespace access operator \.

PHP

<?php

namespace MyApp {
    function strlen($str) {
        return 42;
    }
}

$text = 'Hello';

// Your code here

Need a hint?

Use \strlen($text) to call the global PHP function strlen explicitly.

4

Print the length from the global strlen function

Print the value of the variable $length using echo.

PHP

<?php

namespace MyApp {
    function strlen($str) {
        return 42;
    }
}

$text = 'Hello';

$length = \strlen($text);

// Your code here

Need a hint?

Use echo $length; to display the length.