Basically you have a sign bit, an exponent part, and a mantissa part, and they represent the number

(1-2*sign_bit) * (1.0 + mantissa) * 2^(exponent - K) where K is a constant, exponent is interpreted as an unsigned integer, and mantissa is interpreted as the bits (of a base 2 number) after the decimal point, forming the number 1.abcdefghijklm... where abcdefghijklm... are the bits of the mantissa. And sign_bit is 0 or 1 of course.

I have this problem which says, "A programmer can use the random feature to emulate the flipping of a coin. For example, if the generator produces a number 0 or 1, the value 0 can be assigned heads and the value 1 can be assigned tails.
Write a program that ...

This is just a reminder. When setting environment variables through .htaccess, CLI or dotenv use filter_var() to evaluate a boolean. For example, start the built-in PHP server with these variables: