Simple php watermark script

A very simple script that watermarks an image with a PNG file using php.Just save the below script and run it on your browser.Thats it.Make sure of the path [image and thePNG watermark]

1. <?php//just save this file as <sumname>.php and run this in your website or locahost//make sure the path specified for your image and the watermark png is corectfunction watermark($sourcefile, $watermarkfile) {

   # $sourcefile    = Filename of the picture to be watermarked.

   # $watermarkfile   = Filename of the 24-bit PNG watermark file.

   //Get the resource ids of the pictures

   $watermarkfile_id   = imagecreatefrompng($watermarkfile);

   imageAlphaBlending($watermarkfile_id, false);

   imageSaveAlpha($watermarkfile_id, true);

   $fileType = strtolower(substr($sourcefile, strlen($sourcefile)-3));

   switch($fileType) {

   case(“gif”):

   $sourcefile_id = imagecreatefromgif($sourcefile);

   break;

   case(“png”):

   $sourcefile_id = imagecreatefrompng($sourcefile);

   break;

   default:

   $sourcefile_id = imagecreatefromjpeg($sourcefile);

   }

   //Get the sizes of both pix

   $sourcefile_width   = imageSX($sourcefile_id);

   $sourcefile_height   = imageSY($sourcefile_id);

   $watermarkfile_width   = imageSX($watermarkfile_id);

   $watermarkfile_height   = imageSY($watermarkfile_id);

   $dest_x     = ( $sourcefile_width / 2 ) – ( $watermarkfile_width / 2 );

   $dest_y     = ( $sourcefile_height / 2 ) – ( $watermarkfile_height / 2 );

   // if a gif, we have to upsample it to a truecolor image

   if($fileType == “gif”) {

   // create an empty truecolor container

   $tempimage = imagecreatetruecolor($sourcefile_width, $sourcefile_height);

   // copy the 8-bit gif into the truecolor image

   imagecopy($tempimage, $sourcefile_id, 0, 0, 0, 0, $sourcefile_width, $sourcefile_height);// copy the source_id int

   $sourcefile_id = $tempimage;

   }

   imagecopy($sourcefile_id, $watermarkfile_id, $dest_x, $dest_y, 0, 0, $watermarkfile_width, $watermarkfile_height);

   //Create a jpeg out of the modified picture

   switch($fileType) {

   // remember we do not need gif any more, so we use only png or jpeg.

   // See the code above to see how we handle gifs

   case(“png”):

   header(“Content-type: image/png”);

   imagepng ($sourcefile_id);

   break;

   default:

   header(“Content-type: image/jpg”);

   imagejpeg ($sourcefile_id);

   }

   imagedestroy($sourcefile_id);

   imagedestroy($watermarkfile_id);

   }

   watermark(“mypic.jpg”,”logo.png”);

   ?>

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