Project Euler Problem 2 (PHP)

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Problem 2

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.

Answer  Show ▼

Script

Execution Time: 0.0001 seconds

$sum = 0;

$val1 = 1;
$val2 = 2;

$maxVal = 4000000;
while ($val2 < $maxVal) {
    if ($val2%2 == 0) {
        $sum += $val2;
    }

    $temp = $val2;
    $val2 = $val1+$val2;
    $val1 = $temp;
}

echo $sum.PHP_EOL;

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