<?php

  session_start();
  $_SESSION['kode_validate_code'] = "";
  $validate_code = "";
  $font = "kode_font_pl.ttf";

  $validate_char = "1,2,3,4,5,6,7,8,9,a,b,c,d,e,f";
  $list = explode(",", $validate_char);
  for ($i = 0; $i < 4; $i++) {
      $randnum = rand(0, 14);
      $validate_code .= $list[$randnum];
  }

  $_SESSION['kode_validate_code'] = $validate_code;

  
  $im = imagecreatetruecolor(80, 25);
  
  $color = imagecolorallocate($im, 0, 0, 0);
  $bg = imagecolorallocate($im, 255, 255, 255);
  
  imagefill($im, 1, 1, $bg);
  
  for ($i = 0; $i < 4; $i++) {
      ImageTTFText($im, 18, 0, 18 * $i, 25, $color, $font, $validate_code[$i]);
  }

  header('Content-type:image/gif');
  ImageGif($im);
  imagedestroy($im);
?>