[snip]
What are magic numbers?  Surely you don't mean the file recognition
codes
in /etc/magic for use by file(1) under *NIX...
[/snip]

Magic numbers are hard coded numbers that are not referrenced by a
variable i.e.

$thisNumber = (4 == $magic)? do stuff: do other stuff;

should be 

$var = 4;
$thisNumber = ($var == $magic)? do stuff: do other stuff;

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