How to dynamically assign a value to a class property in PHP?

Question

I would like to assign a value in a class property dynamically (that is referring to it using a variable).

#Something like: 
setPropValue($obj, $propName, $value);

Answer 1

Like this?

$myClass = new stdClass();
$myProp = 'foo';
$myClass->$myProp = 'bar';
echo $myClass->foo; // bar
echo $myClass->$myProp; // bar

Answer 2

$obj->$propName = $value;

Answer 3

In case you want to do this for static members, you can use variable variables:

class Foo
{
    public static $foo = 'bar';
}

// regular way to get the public static class member
echo Foo::$foo; // bar

// assigning member name to variable
$varvar = 'foo';
// calling it as a variable variable
echo Foo::$$varvar; // bar

// same for changing it
Foo::$$varvar = 'foo';
echo Foo::$$varvar; // foo