<?php
$fib = array(1,2,3);
$sum = 2;
while($fib[2] < 4000000) {
	$fib[2] = $fib[0] + $fib[1];
	if($fib[2] % 2 == 0) {
		$sum += $fib[2];
	} 
	$fib[0] = $fib[1];
	$fib[1] = $fib[2];
}
echo $sum;