Código:
  
 	public function add_muro(){
		db::set_names();
		$date = date("Y-m-d");
		//definimos las variables
		$m_user_escritor		=	$_SESSION['user_zero'];
		$m_user_receptor		=	strip_tags($_POST['m_user_receptor']);
		$m_texto   =   strip_tags($_POST['m_texto']);
		//hacemos el insert
		$sql="INSERT INTO `m_muro` (`m_user_escritor`, `m_user_receptor`, `m_texto`, `m_date`) VALUES (?, ?, ?, '$date')";
		$stmt=db::getInstance()->prepare($sql);
		//insertamos las variables
		$stmt->bindParam(1, $m_user_escritor);
		$stmt->bindParam(2, $m_user_receptor);
		$stmt->bindParam(3, $m_texto);
		$stmt->execute();
 
 




