gistfile1.txt

 <?php
 $filename= "index.txt";
    $handle = fopen($filename, "r");
    $contents = fread($handle, filesize($filename));
    fclose($handle);

$input= explode("\n",$contents);

foreach($input as $num){
  $factorial = 1;
  for ($x=$num; $x>=1; $x--)
  {
   $factorial= $factorial * $x;
   }

$number = $factorial;

    $array  = array_map('intval', str_split($number));

    $arr = $array;
    $remove = array(0);
    $result = array_diff($arr, $remove);
echo "$num => " ;
    print_r(end($result));
    echo"<br>";
}
  ?>