Large numbers in PHP are not what they seem to be

Question

I agree with this

php > var_dump(number_format(10000000000000000000000)); // 10^22
php shell code:1:
string(30) \"10,000,000,000,000,000,000,000\"
         


        

Answer 1

Floating point numbers.

Computer memory is limited, so storing an infinitely precise integer value is impossible. Your system basically ran out of room for precise integer valuation.

This answer does a great job talking about how to get the integer to appear at the number you want it though.