The Never-ending Variable - PHP

Another interesting quirk about variable variables is that they are seemingly infinite. The following code works just fine to produce "The Great Thing About Variable Variables Is They Never End!":

$x = "The";
$$x = "Great";
$$$x = "Thing";
$$$$x = "About";
$$$$$x = "Variable";
$$$$$$x = "Variables";
$$$$$$$x = "Is";
$$$$$$$$x = "They";
$$$$$$$$$x = "Never";
$$$$$$$$$$x = "End!";
echo "$x ${$x} ${${$x}} ${${${$x}}} ${${${${$x}}}} ${${${${${$x}}}}} 
${${${${${${$x}}}}}} ${${${${${${${$x}}}}}}} ${${${${${${${${$x}}}}}}}}
${${${${${${${${${$x}}}}}}}}}";

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