Would this be a good way to watermark images with PHP?

<?
function watermarkImage ($SourceFile, $WaterMarkText, $DestinationFile) {
   list($width, $height) = getimagesize($SourceFile);
   $image_p = imagecreatetruecolor($width, $height);
   $image = imagecreatefromjpeg($SourceFile);
   imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width, $height);
   $black = imagecolorallocate($image_p, 0, 0, 0);
   $font = 'arial.ttf';
   $font_size = 10;
   imagettftext($image_p, $font_size, 0, 10, 20, $black, $font, $WaterMarkText);
   if ($DestinationFile<>'') {
      imagejpeg ($image_p, $DestinationFile, 100);
   } else {
      header('Content-Type: image/jpeg');
      imagejpeg($image_p, null, 100);
   }
   imagedestroy($image);
   imagedestroy($image_p);
}

/******** usage **********/
$SourceFile = '/home/user/www/images/image1.jpg';
$DestinationFile = '/home/user/www/images/image1-watermark.jpg';
$WaterMarkText = 'Copyright phpJabbers.com';
watermarkImage ($SourceFile, $WaterMarkText, $DestinationFile);
?>

PHP:

As I look at the code, it looks like it would be a way to watermark images one at a time, as if redundant code would be needed to do it again...

Could I replace

$DestinationFile = '/home/user/www/images/image1-watermark.jpg';

PHP:

with a wildcard :

 $DestinationFile = '/home/user/www/images/*';

PHP:

so that anything in the images directories ends up getting converted into a watermarked image.
(So if this worked, the same thing would need to be done with $SourceFile )

I'm also wondering if this would be a good way to watermark videos?

 

Its a function so read the files from the folder and loop it.

$files = array();
$pathToSrcDir = "\Path\to\your\files\";
$pathToDestDir = "\Path\to\your\Newfiles\";
$supported_ext = array('gif', 'jpg', 'jpeg');
$dir = @opendir($pathToSrcDir);

while ($file = @readdir($dir)){
      if (!is_dir($pathToSrcDir.$file)){
            watermarkImage ($pathToSrcDir.$file, $WaterMarkText, $pathToDestDir.$file);
      }
}

@closedir($dir);

PHP: