note 29273 added to language.variables.scope

It's possible to use a variable variable when specifying a variable as global in a function. That way your function can decide what global variable to access in run-time. function func($varname) { global $$varname; echo $$varname; } $hello = "hello world!"; func("hello"); This will print "hello world!", and is roughly the same as passing by reference, in the case when the variable you want to pass is global. The advantage over references is that they can't have default parameters. With the method above, you can do the following. function func($varname = FALSE) { if ($varname === FALSE) echo "No variable."; else { global $$varname; echo $$varname; } } $hello = "hello world!"; func("hello"); // prints "hello world!" func(); // prints "No variable." -- http://www.php.net/manual/en/language.variables.scope.php http://master.php.net/manage/user-notes.php?action=edit+29273 http://master.php.net/manage/user-notes.php?action=delete+29273 http://master.php.net/manage/user-notes.php?action=reject+29273