<?php

function imagettfstroketext(&$image, $size, $angle, $x, $y, &$textcolor, &$strokecolor, $fontfile, $text, $px) {

    for($c1 = ($x-abs($px)); $c1 <= ($x+abs($px)); $c1++)
        for($c2 = ($y-abs($px)); $c2 <= ($y+abs($px)); $c2++)
            $bg = imagettftext($image, $size, $angle, $c1, $c2, $strokecolor, $fontfile, $text);

   return imagettftext($image, $size, $angle, $x, $y, $textcolor, $fontfile, $text);
}

//Process all the GET arguments
//text
if(!isset($_GET["text"]))
    die;

$text = $_GET["text"];
if(strlen($text) <= 0)
    die;

$text = strtoupper($text);

//opacity
/*if(!isset($_GET["opacity"]))
    $opacity = 256;
else
    $opacity = $_GET["opacity"];

if(is_null($opacity) || $opacity > 256)
    $opacity = 256;
elseif($opacity < 0)
    $opacity=0;*/

//Font size
if(!isset($_GET["fontSize"]))
    $fontSize = 50;
else
    $fontSize = $_GET["fontSize"];

if(is_null($fontSize))
    $fontSize = 64;
elseif($fontSize > 128)
    $fontSize = 128;
elseif($fontSize < 16)
    $fontSize = 16;

$strokeSize = round($fontSize * 0.05);

//Determine how much we need to offset the font
$totalCharHeight = $fontSize + (2 * $strokeSize);
$sizeOffset = $totalCharHeight * 0.2;

//Figure out how big of an image we need
$box = imagettfbbox($fontSize,0,"fonts/impact.ttf",$text);
$width = abs($box[4] - $box[0]);
$width = $width + (2 * $sizeOffset);
$height = abs($box[5] - $box[1]);
$height = $height + (2 * $sizeOffset);

//Create the image
$img = imagecreatetruecolor($width,$height);

//Allocate colors
$bg = imagecolorallocate($img,0,61,166);
//$fontColor = imagecolorallocatealpha($img,0,0,0,$opacity);
//$strokeColor = imagecolorallocatealpha($img,201,215,238,$opacity);
$fontColor = imagecolorallocate($img,0,0,0);
$strokeColor = imagecolorallocate($img,201,215,238);

imagefill($img,0,0,$bg);

//Place the text
imagettfstroketext($img,$fontSize,0,$sizeOffset,$fontSize+$sizeOffset+$strokeSize,$fontColor,$strokeColor,"fonts/impact.ttf",$text,$strokeSize);

//Send the image
header('Content-type: image/png');
imagepng($img);
imagedestroy($img);
?>