23 lines
202 B
PHP
23 lines
202 B
PHP
|
<?php
|
||
|
|
$pre = 0;
|
||
|
|
$cur = 1;
|
||
|
|
$nex = 0;
|
||
|
|
|
||
|
|
$s = 0;
|
||
|
|
|
||
|
|
$cap = 4000000;
|
||
|
|
|
||
|
|
while ($cur <= $cap) {
|
||
|
|
$nex = $pre + $cur;
|
||
|
|
$pre = $cur;
|
||
|
|
$cur = $nex;
|
||
|
|
|
||
|
|
if ($cur % 2 == 0) {
|
||
|
|
$s = $s + $cur;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
echo $s . "\n";
|
||
|
|
|
||
|
|
?>
|