<? 
$faddr="data.txt";
srand(time());
$txt="AbcDeFghIj1234567890";
$file=fopen($faddr,"w");  
if ($file) {
  for($r=0;$r<5;$r++) {
    $id = 50001 + $r;
    $data = substr($txt,rand() % 20,1);
    fputs($file,"$id,$data\n");
    echo "Add records $id,$data : ok<br>";
  }
  fclose($file);
} else {
  echo "Can not open file";
}
?>