How can meaningful naming conventions and clear documentation improve the readability and maintainability of PHP code, especially in object-oriented programming?

Meaningful naming conventions and clear documentation can improve the readability and maintainability of PHP code by making it easier for developers to understand the purpose and functionality of different parts of the code. By using descriptive names for variables, functions, classes, and methods, developers can quickly grasp what each component does without having to decipher cryptic or vague names. Additionally, well-written documentation can provide insights into the overall structure of the codebase, how different components interact with each other, and any important considerations for future modifications or updates.

/**
 * Class representing a user in the system.
 */
class User {
    private $userId;
    private $username;
    
    public function __construct($userId, $username) {
        $this->userId = $userId;
        $this->username = $username;
    }
    
    /**
     * Get the user's ID.
     *
     * @return int The user's ID.
     */
    public function getUserId() {
        return $this->userId;
    }
    
    /**
     * Get the user's username.
     *
     * @return string The user's username.
     */
    public function getUsername() {
        return $this->username;
    }
}