Create different size thumbnails, while uploading the image

Recently I came across  a problem where I had to upload different size of thumbnails to amazon s3, after going through several  stackoverflow answers created small function which exactly addressed my requirement.

 private function createThumbs( $file, $w, $h){
    try{      
        list($width, $height) = getimagesize($file);
        $r = $width / $height;      
             
          if ($w/$h > $r) {
             $newwidth = $h*$r;              
             $newheight = $h;          
          } else {            
             $newheight = $w/$r;              
             $newwidth = $w;        
          }      
               
          $src = imagecreatefromjpeg($file);      
          $dst = imagecreatetruecolor($newwidth, $newheight);      
          imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth,
               $newheight, $width, $height);
         // Begin capturing the byte stream    
         ob_start();      
         // generate the byte stream      
         imagejpeg($dst, null, 100);      
         // and finally retrieve the byte stream      
         $rawImageBytes = ob_get_clean();      
         imagedestroy($dst);
        return $rawImageBytes;
     } catch (\Exception $e){      
     throw new \Exception($e->getMessage());  
  }
 }

get the image data

 // 600px 600px image
$image_600_data = $this->createThumbs($_FILES["fileToUpload"]["tmp_name"], 600, 600);
// 300px 300 px image
$image_300_data = $this->createThumbs($_FILES["fileToUpload"]["tmp_name"], 300, 300);
// 100px 100px image
$image_100_data = $this->createThumbs($_FILES["fileToUpload"]["tmp_name"], 100, 100);

this will display the 100/300/600 images separately. just to make sure ;)

echo "<img src="data:image/jpeg;base64,&quot; . base64_encode( $image_100_path ) . " />";
echo "<img src="data:image/jpeg;base64,&quot; . base64_encode( $image_300_path ) . " />";
echo "<img src="data:image/jpeg;base64,&quot; . base64_encode( $image_600_path ) . " />";