I think what you are asking about (but not sure) is getting away from the if/else block. You may be looking for ...

$number = 1;
$code = "foo_".$number;
&{$code}();
[download]

But, i usually suggest shying away from that unless absolutly needed, because it can get terribly difficult to maintain. But, when it is needed, it is a good tool

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_{can't sleep clowns will eat me}
-- MZSanford