Is there a function that will strip or add commas?

I'm trying to do calculations with attendance numbers of football games...
for example:  33,153

right now I don't have a comma for the numbers in the database. So the above
example is 33153 in my database. If I put the comma in, when I try to do
calculations with php it sees it as 33 instead of 33,153.

So is there a way to add that comma afterwards? Perhaps a string function at
will put the comma in after the first 3 characters?


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