Initializing variables

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I'm reading PHP security paper by Chris Shiflett. 
Trying to figure out what is meant by first
initializing a variable.  
Now, just for the record, I'm not completely dumb.
I know you can start with a 
$var = 2

What I want to know is if the variable assignment is
unknown, as in a user form.
Would I then just initialize the variables to 0 ?

Stuart

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