watermark.php : General Help with pHp

[chewbears]

<?php

#####################################################
# originally gleaned from
# http://www.fedeblog.com.ar/files/view.php?i=Watermark/watermark.php
# Modified by Liem Bahneman ([e-mail]) with some 
# path enhancements when called to handled subdirectories


#####################################################
# Okay to edit these

# what is the root of your files?
$basedir="/images";
$watermarkimage="watermark.png";

#####################################################
# end user modifiable stuff...

$file=basename($_GET['i']);
$path=($_GET['p']);

$image = $basedir."/".$path."/".$file;
$watermark = $basedir."/".$watermarkimage;

$im = imagecreatefrompng($watermark);

$ext = substr($image, -3);

if (strtolower($ext) == "gif") {
    if (!$im2 = imagecreatefromgif($image)) {
        echo "Error opening $image!"; exit;
    }
} else if(strtolower($ext) == "jpg") {
    if (!$im2 = imagecreatefromjpeg($image)) {
        echo "Error opening $image!"; exit;
    }
} else if(strtolower($ext) == "png") {
    if (!$im2 = imagecreatefrompng($image)) {
        echo "Error opening $image!"; exit;
    }
} else {
    die;
}

imagecopy($im2, $im, (imagesx($im2)/2)-(imagesx($im)/2), (imagesy($im2)/2)-(imagesy($im)/2), 0, 0, imagesx($im), imagesy($im));

if($_GET[repeat]) {
    $waterless = imagesx($im2) - imagesx($im);
    $rest = ceil($waterless/imagesx($im)/2);

for($n=1; $n<=$rest; $n++) {
    imagecopy($im2, $im, ((imagesx($im2)/2)-(imagesx($im)/2))-(imagesx($im)*$n), (imagesy($im2)/2)-(imagesy($im)/2), 0, 0, imagesx($im), imagesy($im));
    imagecopy($im2, $im, ((imagesx($im2)/2)-(imagesx($im)/2))+(imagesx($im)*$n), (imagesy($im2)/2)-(imagesy($im)/2), 0, 0, imagesx($im), imagesy($im));
}
}

$last_modified = gmdate('D, d M Y H:i:s T', filemtime ($image));

header("Last-Modified: $last_modified");
header("Content-Type: image/jpeg");
imagejpeg($im2,NULL,95);
imagedestroy($im);
imagedestroy($im2);

?> 

Above is a .php code I found on the internet. I have made some changes to make it work for me however it is not working. I am using mod - rewrite which I know is solid, but my pHp ability is lacking so I feel this is the root of my problem.

All my images are in /images/photo_test_collection/photo_test_album

My watermark.png and watermark.php are together in /image

Do I have the above correct, and does the above code work with mod-rewrite?

[jeremyphphaven]

Hey, both questions I think we would ask you. Try it out in a test environment, come back to post whatever problems you have. NOTE you must have apache mod-rewrite installed and configure properly in your environment AND you must have the GDI library installed an configured properly in your environment to do the image manipulations.

[chewbears]

<?php

header('Content-Type: image/jpeg');

$wm = imagecreatefrompng('watermark.png');
//get dimensions
$h = imagesy($wm);
$w = imagesx($wm);
//load image to be watermarked
$image_directory = $SERVER['DOCUMENT_ROOT']."/images/plogger_test_collection/plogger_test_album";
$image = imagecreatefromjpeg($GET['img'] . ".jpg");
$offset = 10;
$x = imagesx($image) - ($w+$offset);
$y = imagesy($image) - ($h+$offset);
//merges them
imagecopymerge($image, $wm, $x, $y, 0, 0, $w, $h, 100);
imagejpeg($image);
//clear memory
imagedestroy($image);
imagedestroy($wm);
?>

I have tested the above and have done it with some sucess however $_SERVER['DOCUMENT_ROOT']."/images/plogger_test_collection/plogger_test_album";

does not let me view the files from /images/watermark.php? img=filename

I thought by setting the path variable I was telling it that all files would be coming from that directory and therefore the above should have worked. If I remove the
$_SERVER['DOCUMENT_ROOT']."/images/plogger_test_collection/plogger_test_album";
line and put the php and png in the same folde then
/images/plogger_test_collection/plogger_test_album/watermark.php? img=filename
works perfect, but then I get lost on how to change that in the mod rewrite which I currently have as

<IfModule mod_rewrite.c>
Options +FollowSymLinks

RewriteEngine On

RewriteRule ^{images/plogger_test_collection/plogge_test_album/([/]+)/(.+.jpg)$} watermark.php?img=$1&i=$2 [NC,L]

RewriteCond %{SCRIPT_FILENAME} -f [OR]
RewriteCond %{SCRIPT_FILENAME} -d
RewriteRule .* - [L]

RewriteRule feed/$ /plog-rss.php?path=%{REQUEST_URI} [L]
RewriteRule .* /index.php?path=%{REQUEST_URI} [L]
</IfModule>