This is the infinite series approximation of Pi

There are several key instruments that are used in this code.

• A for loop handles the approximation
• Math is handled iteratively through recursion.

Some things that are less apparent:

• You don't need variable definitions to declare what data you are storing in a variable.
• $result is being returned in plaintext on the page after generating the number
• the “+” specified in the declaration of the $op variable is declaring the sign of the variable(positive).

“*” is used for multiplication “/” is used for division