Using Variable Variables in PHP - Variable Variables with Classes
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Variable Variables work equally well with class objects, the basic syntax of which is almost the same as the use of variable variables with functions. Set the class name into a variable, call the variable variable of that variable and you then have access to variables within that class. Here’s an example:

	class Eric {
  var $foo = "bar";
	}
	
	$Eric = new Eric;
	$v = "Eric";
	echo $$v->foo;

the output of which would be:

	bar

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