How can pi be calculated to a set number of digits in PHP?

Question

How can I calculate the value of pi in PHP up to X decimal numbers.

4 decimal points

3.141

64 d

Answer 1

PHP cannot hold a number that long as far as I know, but 22/7 is an ancient way to calculate PI, though that will not be any better than the PI constant included in PHP. Perhaps you are trying to output a long string of PI as an exercise.