Change A String To Interger

I have a shop with products and on the product display page there is the price! This price can have discounts, extra charges etc and the calculations are done beofre the price is shown. The price is shown as $main_price which is in the format $1.23
How do I: Strip the $ off then convert the rest to interger so I can then do a calc like the following: PHP Code:

If $main_price >= 100.00 then

response.write "blah blah"

End if 

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Text String To A Interger String

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