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Finding the Nth Fibonacci number via PHP

Here is an example of Fibonacci numbers:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...

Write a function f(x) so that return the following eg:

f(2) = 1
f(4) = 2
f(6) = 5
f(8) = 13 etc

And here is th
Dept: General | Read: 54408 | 2018-11-01
Tags: PHP, Test