barcode.php

<?php
$width   = 213;
#$width = 500;
$height  = 58;

$im  = ImageCreate($width, $height);
$bg  = ImageColorAllocate($im, 255, 255, 255);
$tx  = ImageColorAllocate($im, 0, 0, 0);
$ln  = ImageColorAllocate($im, 0, 0, 0);

$barfont = realpath("free3of9.ttf");

$id = $_REQUEST["id"];
ImageTTFText($im, 50, 0, 3, 53, $tx, $barfont, "*R{$id}E*");

header("Cache-Control: max-age=3600");
header("Content-Type: image/png");
imagepng($im);
imagedestroy($im);
exit();
?>