<?php
$steamid = "STEAM_0:1:1234567890";

$array = explode(":", $steamid);

$a = (string)((int)$array[0] + 1);

$b = (string)((int)$array[1] + 1);

$c = $array[2];

$bybid = $a . $b . $c;

header("Content-type: image/png");

$im = imagecreate(100, 80);
$colour = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);
imagestring($im, 35, 0, 0, 'SteamID', $textcolor);
imagestring($im, 35, 25, 25, $bybid, $textcolor);

imagepng($im);

?>