PHP script for the Euler’s Problem 2.
Question:
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.
Solution for the above problem solved in PHP:
<?php
$sum = 0;
$first = 1;
$second = 2;
echo "<b>EVEN Values from Fibonacci Series </b><br />";
//check if the second value is less than 4 million
while ($second < 4000000)
{
//check whether the value is odd or even
if($second % 2 == 0)
{
$sum += $second;
echo $second."<br>";
}
//keep the first value in a temporary variable
$tmp = $first;
//assign the second value to first
$first = $second;
//add the temp value and second
$second = $tmp + $second;
}
//display the final value
echo "<br /><b>TOTAL: </b>". $sum;
?>
<?php
$sum = 0;
$first = 1;
$second = 2;
echo "<b>EVEN Values from Fibonacci Series </b><br />";
//check if the second value is less than 4 million
while ($second < 4000000)
{
//check whether the value is odd or even
if($second % 2 == 0)
{
$sum += $second;
echo $second."<br>";
}
//keep the first value in a temporary variable
$tmp = $first;
//assign the second value to first
$first = $second;
//add the temp value and second
$second = $tmp + $second;
}
//display the final value
echo "<br /><b>TOTAL: </b>". $sum;
?>
<?php
$sum = 0;
$first = 1;
$second = 2;
echo "<b>EVEN Values from Fibonacci Series </b><br />";
//check if the second value is less than 4 million
while ($second < 4000000)
{
//check whether the value is odd or even
if($second % 2 == 0)
{
$sum += $second;
echo $second."<br>";
}
//keep the first value in a temporary variable
$tmp = $first;
//assign the second value to first
$first = $second;
//add the temp value and second
$second = $tmp + $second;
}
//display the final value
echo "<br /><b>TOTAL: </b>". $sum;
?>
How the code works is explained in the above code itself. Hope you Enjoy!