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<?php

/*****************************

 * ProjectEuler - Problem 2

 * By Ross Marks

 *****************************

 * Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

 *

 * 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

 *

 * By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

 ****************************/



$awns = 0;

$prev = 1;

for($curr = 2; $curr < 4000000;){



    if($curr % 2 == 0 ){ $awns += $curr; } // if is even then add to awns



    $buff = $curr;

    $curr += $prev;

    $prev = $buff;



}



echo "Awnser: ".$awns;



?>

Project Euler Solutions by Ross Marks