PHP static variables

<? PHP
Class math {
Const Pi = 3.14;

Public static functions squared ($ v ){
Return $ v * $ V;
}

Public static function cubed ($ v ){
Return self: squared ($ v) * $ V;
}

Public static function circlearea ($ radius ){
Return self: squared ($ radius) * Self: PI;
}

Public static function rectanglearea ($ edgelength ){
Echo 'rectangle area is '. SELF: squared ($ edgelength). "/N ";
}
}

$ math = new math ();
echo $ math-> circlearea (3 ). "/N"; // static methods can be accessed using class instances
$ math-> rectanglearea (3);
echo Math: squared (4 ). "/N"; // The static method can also be accessed with the class name and scope identifier
echo Math: pI * 2. "/N"; // 2 and. there must be spaces between them
// static member variables cannot be accessed by class instances
echo $ math-> pI * 2; // access using the class name and scope identifier
?>