> First, we define $foo and load it with NULL so that it is available for
> referencing.
It turns out loading $foo is superfluous; I can get away with just:
$foo = function($foo) use (&$foo) {
$foo();
}
> Next, in terms of program logic, we create a closure with a lexical
> ('use') variable of a reference to $foo, which is then assigned to
> $foo. Thus, the reference to $foo in the closure declaration now
> points to the closure itself.
That much is clear; but why $foo is all of the sudden bound within the
closure when I use by reference (&$foo) as opposed to use by value
($foo) is mysterious.
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