Description:
------------
In a function inside a class, I can only set array elements through the $xyz = array("key"=>"val") syntax. If I attempt to set with $xyz['key'] = 'val', the whole array is replaced with 'val' and it just becomes a normal variable, not an array.

Reproduce code:
---------------
<?php

class Test {

	public $array;

	function arraytester() {

		$this->$array = array("key1"=>"val1", "key2"=>"val2");
		
		print_r($this->$array);

		$this->$array['key1'] = 'val3';
		
		print_r($this->$array);
	}
}


$class = new Test;

$class->arraytester();
?>

Expected result:
----------------
Array ( [key1] => val1 [key2] => val2 ) Array ( [key1] => val3 [key2] => val2 )

Actual result:
--------------
Array ( [key1] => val1 [key2] => val2 ) val3