Variable Variables? - PHP

A variable variable is, in short, a method of using the value of one variable to call the name of another. For instance, if I had a variable $x with the value of "Eric", I could set a variable $Eric to "Seufert" by simply writing $$x = "Seufert". This process calls the value of $x and then creates a variable out of it. Therefore,

echo "$x ${$x}";

would produce the same output as,

echo "$x $Eric";

which is:

Eric Seufert

Notice the curly braces around the variable variable in the first echo statement. This is the standard syntax for outputting variable variables. Omitting the curly braces would have resulted with the following output:

Eric $Eric

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