I'm making a script that processes PI in PHP. I figured that there is a limit of 13 digits that PHP can process. I tried to find solutions on the internet, and was able to turn this number down, but not up. I think PHP is only 32-bit. Is there a limit on 32-bit frameworks, how many digits they can have in a float value?
Yes, on 32-bit systems, with a 32-bit arithmetic unit in the CPU, a 32-bit number is limited to 32 binary digits.
Of course, in most computers, things are not this simple. Software can provide slower support for capabilities that are not in the hardware. How those bits are divided between (for example) exponent and mantissa obviously affects the number of significant digits that can be represented.
The Wikipedia article is a useful introduction.