What are some best practices for writing and organizing PHP code to ensure maintainability and scalability?

Issue: To ensure maintainability and scalability of PHP code, it is important to follow best practices such as using proper naming conventions, organizing code into logical sections, and utilizing design patterns. Code snippet: 

<?php

// Example of using proper naming conventions
class User {
    private $firstName;
    private $lastName;

    public function getFullName() {
        return $this->firstName . ' ' . $this->lastName;
    }
}

// Example of organizing code into logical sections
require_once 'config.php';
require_once 'functions.php';
require_once 'classes/User.php';

// Example of utilizing design patterns
interface Logger {
    public function log($message);
}

class FileLogger implements Logger {
    public function log($message) {
        // Log message to a file
    }
}

?>

Keywords

PHP code organization maintainability scalability error handling

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