<?php

header("Connection: close");

$max_width = 600;
$max_height = 600;
$imagequality = 80;
$watermark = true;

// Path of the original image, ideally get this from an id passed as a querystring
// or use .htaccess to redirect all images though this script
$path = "./images/file.jpg";

if (!file_exists($path)) {
	header('HTTP/1.0 404 Not Found');
	header('Content-type: image/jpeg');
	$img = imagecreatefromjpeg("./images/404.jpg");
	imagejpeg($img, null, 50);
	imagedestroy($img);
	exit;
} Else {

	//Hotlinking Referer Check
	if (preg_match('/www\.yoursite\.co\.uk/i', $_SERVER["HTTP_REFERER"])) {
		$refererpassed = true;
	} else {
		$refererpassed = false;
	}

	if(!$refererpassed){
		header('HTTP/1.0 403 Forbidden');
		header('Content-type: image/gif');
		$img = imagecreatefromgif("./images/image_to_show_if_hotlinked.jpg");
		imagegif($img, null, 100);
		imagedestroy($img);
		mysql_close($connectionid);
		exit;
	}
	// - End Referer check


	// Cache control		
	header("Cache-Control: public");

	$last_modified = filemtime($path);

	// check if the browser has this image in its cache,
	if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
		$if_modified_since = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
	} else {
		$if_modified_since = 0;
	}

	header("Last-Modified: " . gmdate("D, d M Y H:i:s", $last_modified) . " GMT");

	//if not modified tell browser to used cached version
	if (strtotime($if_modified_since) >= $last_modified) {
		header('HTTP/1.0 304 Not Modified');
		exit;
	}


	$image = imagecreatefromstring($imagedata[0]['content']);
	$width_orig = imagesx($image);
	$height_orig = imagesy($image);

	$ratio_orig = $width_orig/$height_orig;

	if ($max_width/$max_height > $ratio_orig) {
		$width = $max_height*$ratio_orig;
	} else {
		$height = $max_width/$ratio_orig;
	}

	$image_p = imagecreatetruecolor($width, $height);
	// Resample/Resize image
	imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

	if($watermark){
		// Colours
		$black = imagecolorallocate($image_p, 0, 0, 0 );
		$white = imagecolorallocate($image_p, 255, 255, 255);
		// Add black border at top
		imagefilledrectangle($image_p,0,0,$width,20,$black);

		$tag = "Copyright http://www.yoursite.co.uk/";

		/*The first parameter is our handle, then font size, rotation,
		starting X, starting Y, text color, font, and finally our text. */
		ImageTTFText($image_p, 10, 0, $width - 290, 15, $white, "./Verdana_Bold.ttf", $tag);
	}
	
	switch(file_extension($path)){

		case "jpg":
		case "jpeg":
			header('Content-type: image/jpeg');
			imagejpeg($image_p, null, $imagequality);
			break;

		case "gif":
			header('Content-type: image/gif');
			imagegif($image_p, null, $imagequality);
			break;

		case "png":
			header('Content-type: image/png');
			imagepng($image_p, null, $imagequality);
			break;
	
		default:
			header('Content-type: image/jpeg');
			imagejpeg($image_p, null, $imagequality);
			break;
	}

//cleanup
imagedestroy($image);
imagedestroy($image_p);
}

function file_extension($filename)
{
	$path_info = pathinfo($filename);
	return $path_info['extension'];
}


?>