There is the line marked with '#*' in the following script. One line up you will find other line that should make the exactly same action (I think). Try to comment this line and uncomment line with '#*'. The output will differ. Why?

--- SCRIPT: START ---
<PRE><?php

class test {
	function test() {
		extfunc($this);
	}
}
#___________________________________________________________
function extfunc(&$ref) {
global $obj;
	$GLOBALS["obj"]=&$ref; # This is the same as '$obj=&$ref;'. Isn't it?
	#* $obj=&$ref;
}

#===========================================================
$test=new test();
var_dump($obj);

?></PRE>
--- SCRIPT: END ---