<?php
error_reporting (-1);
$sum=0;
$f1=1;
$f2=2;

do {
	echo "$f1, ";
	$sum += $f1;
	$f3=$f1+$f2;
	$f1=$f2;
	$f2=$f3;
} while ($f1 < 4000000);

echo "\nСумма - $sum";