CREATE TABLE teachers ( id INT PRIMARY KEY, name VARCHAR(255), email VARCHAR(255), phone VARCHAR(255), address VARCHAR(255) );

CREATE TABLE subjects ( id INT PRIMARY KEY, name VARCHAR(255), code VARCHAR(255) );

CREATE TABLE attendance ( id INT PRIMARY KEY, student_id INT, date DATE, status VARCHAR(255) );

public function __construct($host, $username, $password, $database) { $this->mysqli = new mysqli($host, $username, $password, $database); }