What are the best practices for organizing and accessing functions and variables across multiple PHP files?

When working with multiple PHP files, it's important to organize functions and variables in a way that allows for easy access and maintenance. One common approach is to use include or require statements to bring in external files that contain the necessary functions and variables. By organizing related functions and variables in separate files and including them where needed, you can keep your code modular and easier to manage. 

// functions.php
function greet() {
    echo "Hello, World!";
}

// index.php
include 'functions.php';
greet();

Keywords

namespaces include require global variables autoload

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