Watermark

PHP
1

I have a function that adds a watermark on a photo after it was uploaded and i don’t understand why I can not apply the watermark:

/********************/
    /*****WATERMARK*****/
    /********************/

        function doWatermark($calePoza, $caleLogo, $pozitionare = 'centru') {
          $watermark = imagecreatefrompng($caleLogo);
         

          $filetype = substr($calePoza,strlen($calePoza)-4,4);
          $filetype = strtolower($filetype);

          if($filetype == ".gif")  {$photo = imagecreatefromgif($calePoza);}
          if($filetype == ".jpg")  {$photo = imagecreatefromjpeg($calePoza);}
          if($filetype == "jpeg") {$photo = imagecreatefromjpeg($calePoza);}
          if($filetype == ".png")  {$photo = imagecreatefrompng($calePoza);}


          imagealphablending($photo, true);
         
          $widthWatermark = imagesx($watermark);
          $heightWatermark = imagesy($watermark);
          $widthPhoto = imagesx($photo);
          $heightPhoto = imagesy($photo);
          if ($pozitionare == 'centru') {
              $xLogoPosition = ceil(($widthPhoto - $widthWatermark) / 2);
              $yLogoPosition = ceil(($heightPhoto - $heightWatermark) / 2);
          } else {     
              $xLogoPosition = $widthPhoto - $widthWatermark - 10;
              $yLogoPosition = $heightPhoto - $heightWatermark - 10;
          }
         
          $result = imagecopy($photo, $watermark, $xLogoPosition, $yLogoPosition, 0, 0, $widthWatermark, $heightWatermark);
         

          if($filetype == ".gif")  {header('Content-type: image/gif');imagegif($photo, $calePoza, 100); }
          if($filetype == "jpeg") {header('Content-type: image/jpeg');imagejpeg($photo, $calePoza, 100);}
          if($filetype == ".jpg")  {header('Content-type: image/jpeg');imagejpeg($photo, $calePoza, 100);}
          if($filetype == ".png")  {header('Content-type: image/png');imagepng($photo, $calePoza, 100);}

          imagedestroy($photo);

          return $result;
       }
2

PS: if i delete :

 if($filetype == ".gif")  {$photo = imagecreatefromgif($calePoza);}

          if($filetype == ".jpg")  {$photo = imagecreatefromjpeg($calePoza);}

          if($filetype == "jpeg") {$photo = imagecreatefromjpeg($calePoza);}

          if($filetype == ".png")  {$photo = imagecreatefrompng($calePoza);}

and replace it with :

$photo = imagecreatefromjpeg($calePoza);

and this :

 if($filetype == ".gif")  {header('Content-type: image/gif');imagegif($photo, $calePoza, 100); }

          if($filetype == "jpeg") {header('Content-type: image/jpeg');imagejpeg($photo, $calePoza, 100);}

          if($filetype == ".jpg")  {header('Content-type: image/jpeg');imagejpeg($photo, $calePoza, 100);}

          if($filetype == ".png")  {header('Content-type: image/png');imagepng($photo, $calePoza, 100);}

with this :

imagejpeg($photo, $calePoza, 100);

everything works fine, but only with .jpeg files.