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

Calculating PI in php?

Why calculate when we already have the M_PI constant?

M_PI contains the value 3.14159265358979323846.

10000 decimal places for PI is quite a number.

See: http://www.php.net/manual/en/math.constants.php