Life of Pi – Working with Pi in PHP

The irrational mathematical constant of Pi can be obtained a few different ways
in PHP. There is a function to give you the value as well as a bunch of
constants that represent Pi as well as fractions of Pi and it’s square root.
Heck, you could even do it the old fashioned way:

$pi = 245850922 / 78256779

But that doesn’t make much sense when there’s so many built-ins. To obtain the
value of Pi with PHP’s built in function is easy (and logically named ;):

$pi = pi

But why use a function when you could simply reference a constant? I mean, Pi
is a constant already, so for me this makes the most sense:

$pi = M_PI

Then for fractions and square roots of pi we can utilize these:

$half_pi          = M_PI_2
$quarter_pi       = M_PI_4
$one_over_pi      = M_1_PI
$two_over_pi      = M_2_PI
$sqrt_pi          = M_SQRTPI
$two_over_sqrt_pi = M_2_SQRTPI
Josh Sherman - The Man, The Myth, The Avatar

About Josh

Husband. Father. Pug dad. Musician. Founder of Holiday API, Head of Engineering and Emoji Specialist at Mailshake, and author of the best damn Lorem Ipsum Library for PHP.

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