How does the concept of Separation of Concerns apply to the instantiation of classes in PHP scripts?

Separation of Concerns in PHP refers to the practice of dividing a program into distinct sections that address separate concerns. When instantiating classes in PHP scripts, it is important to ensure that each class is responsible for a specific task or concern, rather than trying to handle multiple concerns within a single class. This helps improve code readability, maintainability, and reusability.

// Example of Separation of Concerns in PHP class instantiation

// Define a class responsible for handling database operations
class Database {
    public function connect() {
        // Code to establish a database connection
    }
    
    public function query($sql) {
        // Code to execute a database query
    }
}

// Instantiate the Database class in a separate file or section of the script
$database = new Database();
$database->connect();
$queryResult = $database->query("SELECT * FROM users");