Как изменить размер изображения перед загрузкой с помощью PHP?

Я хочу оптимизировать изображения при загрузке на сервер.

У меня есть класс изменения размера:

<?php

        Class resize
        {
            // *** Class variables
            private $image;
            private $width;
            private $height;
            private $imageResized;
            function __construct($fileName)
            {
                // *** Open up the file
                $this->image = $this->openImage($fileName);
                // *** Get width and height
                $this->width  = imagesx($this->image);
                $this->height = imagesy($this->image);
            }
            ## --------------------------------------------------------
            private function openImage($file)
            {
                // *** Get extension
                $extension = strtolower(strrchr($file, '.'));
                switch($extension)
                {
                    case '.jpg':
                    case '.jpeg':
                        $img = @imagecreatefromjpeg($file);
                        break;
                    case '.gif':
                        $img = @imagecreatefromgif ($file);
                        break;
                    case '.png':
                        $img = @imagecreatefrompng($file);
                        break;
                    default:
                        $img = false;
                        break;
                }
                return $img;
            }
            ## --------------------------------------------------------
            public function resizeImage($newWidth, $newHeight, $option = "auto")
            {
                // *** Get optimal width and height - based on $option
                $optionArray = $this->getDimensions($newWidth, $newHeight, $option);
                $optimalWidth  = $optionArray['optimalWidth'];
                $optimalHeight = $optionArray['optimalHeight'];
                // *** Resample - create image canvas of x, y size
                $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
                imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);
                // *** if option is 'crop', then crop too
                if ($option == 'crop') {
                    $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
                }
            }
            ## --------------------------------------------------------

            private function getDimensions($newWidth, $newHeight, $option)
            {
               switch ($option)
                {
                    case 'exact':
                        $optimalWidth = $newWidth;
                        $optimalHeight= $newHeight;
                        break;
                    case 'portrait':
                        $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                        $optimalHeight= $newHeight;
                        break;
                    case 'landscape':
                        $optimalWidth = $newWidth;
                        $optimalHeight= $this->getSizeByFixedWidth($newWidth);
                        break;
                    case 'auto':
                        $optionArray = $this->getSizeByAuto($newWidth, $newHeight);
                        $optimalWidth = $optionArray['optimalWidth'];
                        $optimalHeight = $optionArray['optimalHeight'];
                        break;
                    case 'crop':
                        $optionArray = $this->getOptimalCrop($newWidth, $newHeight);
                        $optimalWidth = $optionArray['optimalWidth'];
                        $optimalHeight = $optionArray['optimalHeight'];
                        break;
                }
                return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
            }
            ## --------------------------------------------------------
            private function getSizeByFixedHeight($newHeight)
            {
                $ratio = $this->width / $this->height;
                $newWidth = $newHeight * $ratio;
                return $newWidth;
            }
            private function getSizeByFixedWidth($newWidth)
            {
                $ratio = $this->height / $this->width;
                $newHeight = $newWidth * $ratio;
                return $newHeight;
            }
            private function getSizeByAuto($newWidth, $newHeight)
            {
                if ($this->height < $this->width)
                // *** Image to be resized is wider (landscape)
                {
                    $optimalWidth = $newWidth;
                    $optimalHeight= $this->getSizeByFixedWidth($newWidth);
                }
                elseif ($this->height > $this->width)
                // *** Image to be resized is taller (portrait)
                {
                    $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                    $optimalHeight= $newHeight;
                }
                else
                // *** Image to be resizerd is a square
                {
                    if ($newHeight < $newWidth) {
                        $optimalWidth = $newWidth;
                        $optimalHeight= $this->getSizeByFixedWidth($newWidth);
                    } else if ($newHeight > $newWidth) {
                        $optimalWidth = $this->getSizeByFixedHeight($newHeight);
                        $optimalHeight= $newHeight;
                    } else {
                        // *** Sqaure being resized to a square
                        $optimalWidth = $newWidth;
                        $optimalHeight= $newHeight;
                    }
                }
                return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
            }
            ## --------------------------------------------------------
            private function getOptimalCrop($newWidth, $newHeight)
            {
                $heightRatio = $this->height / $newHeight;
                $widthRatio  = $this->width /  $newWidth;
                if ($heightRatio < $widthRatio) {
                    $optimalRatio = $heightRatio;
                } else {
                    $optimalRatio = $widthRatio;
                }
                $optimalHeight = $this->height / $optimalRatio;
                $optimalWidth  = $this->width  / $optimalRatio;
                return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
            }
            ## --------------------------------------------------------
            private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
            {
                // *** Find center - this will be used for the crop
                $cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
                $cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );
                $crop = $this->imageResized;
                //imagedestroy($this->imageResized);
                // *** Now crop from center to exact requested size
                $this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
                imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
            }
            ## --------------------------------------------------------

            /*
             * ->showImage($imageQuality = "100")
             * 
             * August 2012, Leonel Rocha (@leonelsr)
             * 
             */
            public function showImage($imageQuality = "100")
            {
                header('Content-Type: image/jpeg');
                imagejpeg($this->imageResized, NULL, $imageQuality);
                imagedestroy($this->imageResized);
            }

            ## --------------------------------------------------------

            public function saveImage($savePath, $imageQuality = "100")
            {
                // *** Get extension
                $extension = strrchr($savePath, '.');
                $extension = strtolower($extension);
                switch($extension)
                {
                    case '.jpg':
                    case '.jpeg':
                        if (imagetypes() & IMG_JPG) {
                            imagejpeg($this->imageResized, $savePath, $imageQuality);
                        }
                        break;
                    case '.gif':
                        if (imagetypes() & IMG_GIF) {
                            imagegif ($this->imageResized, $savePath);
                        }
                        break;
                    case '.png':
                        // *** Scale quality from 0-100 to 0-9
                        $scaleQuality = round(($imageQuality/100) * 9);
                        // *** Invert quality setting as 0 is best, not 9
                        $invertScaleQuality = 9 - $scaleQuality;
                        if (imagetypes() & IMG_PNG) {
                             imagepng($this->imageResized, $savePath, $invertScaleQuality);
                        }
                        break;
                    // ... etc
                    default:
                        // *** No extension - No save.
                        break;
                }
                imagedestroy($this->imageResized);
            }
            ## --------------------------------------------------------
        }
?>

Открываю изображения с url:

$data = file_get_contents('https://image.tmdb.org/t/p/w600_and_h900_bestv2/7a5md4Co0R1lbTrZJO8NeXbUEiw.jpg');

И я попытался изменить размер изображений вот так:

include("resize-class.php");

$resizeObj = new resize($data);
$resizeObj -> resizeImage(300, 450, 0);
$resizeObj -> saveImage($title, 25);
$title = $mtitle.'-'.$year.'.jpg';
file_put_contents('images/'.$title, $data);

Но при этом загружаются изображения исходного размера и качества. Я бы хотел изменить размер изображений до 300x450, использовать качество 25% и сохранить их в формате jpg. Как я могу этого добиться?