There is a plain text document t.txt. It contains 3 numbers. How to use PHP to get from the file number. And perform a loop.
while ($i <= value3) { $result =''; if ($i%$value1==0) { $result .='F';} if ($i%$$value2==0) { $result .='B';} if (!$result) { $result = $i;} $i++; }