Untitled

<?php
  
  $string = md5(microtime() * mktime());
  
  $string = substr($string, 0, 5); 

  header ("Content-type: image/png");
  
  $im = @imagecreatefrompng("./captcha.png")
      or die("Error");
  
  $white = imagecolorallocate($im, 255, 255, 255);

  $font = "verdana.ttf";
  
  imagettftext($im, 3, 0, 1, 1, $white, $font, $string);
  imagepng($im);
  imagedestroy($im);
?>