References : http://projecteuler.net
Euler projects solved in PHP.
These solutions are ment to be run in command line or terminal.
Running these in browser may not always return successful as they may require input from the user, and the input is intended to be from the terminal.
The solutions are best interpreted solutions for the problems and can still be optimized for faster and smoother running on implication and understanding of the solution provided in the Overviews.