<?php


class loginsystem {


	protected $password = null;
	
	public function CheckLogin() {


	if (!$_SESSION['id']) { return false }
	else {
			
			$match = mysql_query("SELECT expire FROM users WHERE expire={$_SESSION['id']} LIMIT=1") or die(mysql_error());
			if (mysql_num_rows($match) > 0) { return true }
			else { return false }
			
		}
	
	}


	public function doregister($name, $pass, $email) {
		
		if ($this->checklogin() == true) { return }
		
		$password = md5($pass);
	
		$match = mysql_query("SELECT username FROM users WHERE username={$name} LIMIT=1") or die(mysql_error());
		if (mysql_num_rows($match) > 0) { return false }
		else {
			
			mysql_query("INSERT INTO users 
			VALUES(null,'{$name}', '{$password}', '{$email}')") or die(mysql_error());
			
		}
		
	}
	
}


?>

class register_check extends loginsystem {


	protected $sql_data = null;
	protected $email = null;


	public function email_check ($mail) {
	
		$this->email = explode($mail, "@");
		
		if (!$email[1]) { return false }
		else {
		
			$this->do_sql("insert", "users", $email);
			return true;
			
		}
	
	}


	protected function do_sql ($type, $table_name, $input) {
	
		$this->sql_data = addslashes(htmlspecialchars($input));
	
		if ($type == "insert") {
		
			mysql_query("INSERT INTO {$table_name}
			VALUES ('{$this->sql_data}')") or die(mysql_error());
		
			return;
			
		}
		
		elseif ($type == "select") {
		
			$query = mysql_query("SELECT * FROM {$table_name}")
			return $query;
			
		}
	
	}
}

<?php


class loginsystem {


	protected $password = null;
	
	public function CheckLogin() {


	if (!$_SESSION['id']) { return false }
	else {
			
			$match = mysql_query("SELECT expire FROM users WHERE expire={$_SESSION['id']} LIMIT=1") or die(mysql_error());
			if (mysql_num_rows($match) > 0) { return true }
			else { return false }
			
		}
	
	}
	
}


class register_check extends loginsystem {


	protected $name = null;
	protected $email = null;


	
	public function do_register ($username, $mail, $password) {
	
		if($this->email_check($username, $mail) == false) { return "email_error"; }
		
		elseif ($this->username_check($username) == false) { return "username_error"; }
		elseif ($this->password_check($password) == false) { return "password_error"; }
	
		else {
		
		mysql_query("INSERT INTO users 
		VALUES(null,'{$this->username}', '{$this->password}', '{$this->email}')") or die(mysql_error());
		
		}
		
	}
	
	protected function email_check ($username, $mail) {
	
		$this->email = explode($mail, "@");
		
		if (!$email[1]) { return false }
		else {
		
			$this->email = htmlspecialchars(mysql_escape_string($mail));
			$this->name = htmlspecialchars(mysql_escape_string($username));
			
			mysql_query("UPDATE users SET email={$mail} WHERE username={$name} LIMIT=1") or die(mysql_error());
			return true;
			
		}
	
	}
	
	protected function username_check($name) {


		protected $username = htmlspecialchars(mysql_escape_string($name));
	
		$check = mysql_query("SELECT username FROM users WHERE username={$username}") or die(mysql_error());
		
		if (mysql_num_rows($check) > 0) { return false }
		else { return true }
	
	}
	
	protected function password_check($pass) {
	
		if (strlen($pass) < 3) { return false }
		else { 
		
			$this->password = md5($pass);
			return true;


		}
	
	}
	
}


?>