Based on https://github.com/T-PWK/go-fibonacci
And quoting:
In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones:
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...
Often, especially in modern usage, the sequence is extended by one more initial term:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...
This implementation has two methods: fibonacci and fibonacci_big.
The fibonacci function is more efficient, however, it returns correct numbers between 0 and 93 (inclusive). The fibonacci_big function, on the other hand, is less efficient but returns practically any Fibonacci number.
Examples:
$f = fibonacci(10);
$fb = fibonacci_big(200);You can run using:
php exec.php
php big.php
The output is
exec.php
Tests - Success.
Tests - Success.
Tests - Success.
Benchmark 10 run: 167,864/sec or 0.0059572034504122ms/op
Benchmark 20 run: 1,370/sec or 0.72992700729927ms/op
Benchmark 10 tuned run: 3,459,629/sec or 0.00028904833437343ms/op
Benchmark 20 tuned run: 2,151,116/sec or 0.00046487497652381ms/op
100: 3.5422484817926E+20
200: 2.8057117299251E+41
300: 2.2223224462942E+62
400: 1.7602368064501E+83