<?php
  // writefile.php by detour@metalshell.com
  //
  // Write to a file using fwrite.
  //
  // http://www.metalshell.com/
  //

  $outfile = "tmpfile";

  $writestring = "first line\nsecond line\nthird line\n";
  $appendstring = "fourth line\n";

  // Open file for writing, any data currently in the file will be lost.
  if(!$fd = fopen($outfile, "w")) {
    echo("Error opening file.");
    exit;
  }

  // Write the string to the file.
  if(!fwrite($fd, $writestring)) {
    echo("Error writing file.");
    exit;
  }

  fclose($fd);

  echo("The file now contains:<br>");
  print_file($outfile);

  // Open file for appending
  if(!$fd = fopen($outfile, "a")) {
    echo("Error opening file.");
    exit;
  }

  // Append the string to the file.
  if(!fwrite($fd, $appendstring)) {
    echo("Error writing file.");
    exit;
  }

  fclose($fd);

  echo("The file now contains:<br>");
  print_file($outfile);



  function print_file($file) {
    if(!$inf = fopen($file, "r"))
      return;

    $data = fread($inf, filesize($file));

    $data = ereg_replace("\n", "<br>", $data);

    echo $data;
  }
?>