How to resize image before upload in PHP?

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// Open the original image
$original_image = imagecreatefromjpeg('original.jpg');

// Create a new blank image with the desired dimensions
$new_width = 200;
$new_height = 150;
$new_image = imagecreatetruecolor($new_width, $new_height);

// Copy and resize the original image onto the new image
imagecopyresampled($new_image, $original_image, 0, 0, 0, 0, $new_width, $new_height, $original_width, $original_height);

// Save the resized image to a new file
imagejpeg($new_image, 'resized.jpg');

// Destroy the original and resized images to free up memory
imagedestroy($original_image);
imagedestroy($new_image);

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if(isset($_POST["upload"])) {
  $image = $_FILES["image"]["tmp_name"];
  $target = "uploads/"; // Folder to save uploaded images
  $filename = basename($_FILES["image"]["name"]);
  $targetFilePath = $target . $filename;
  $imageFileType = pathinfo($targetFilePath, PATHINFO_EXTENSION);

  // Check if the file is an image
  $check = getimagesize($image);
  if($check !== false) {
    // Resize the image
    $newWidth = 500; // New width in pixels
    $newHeight = 500; // New height in pixels

    // Load the image
    switch($check["mime"]) {
      case "image/jpeg":
        $image = imagecreatefromjpeg($image);
        break;
      case "image/png":
        $image = imagecreatefrompng($image);
        break;
      case "image/gif":
        $image = imagecreatefromgif($image);
        break;
      default:
        die("Invalid image format. Only JPEG, PNG, and GIF allowed.");
    }

    // Resize the image
    $resizedImage = imagescale($image, $newWidth, $newHeight);

    // Save the resized image
    switch($check["mime"]) {
      case "image/jpeg":
        imagejpeg($resizedImage, $targetFilePath);
        break;
      case "image/png":
        imagepng($resizedImage, $targetFilePath);
        break;
      case "image/gif":
        imagegif($resizedImage, $targetFilePath);
        break;
    }

    // Free up memory
    imagedestroy($image);
    imagedestroy($resizedImage);

    // Display a success message
    echo "Image uploaded and resized successfully.";
  } else {
    echo "Invalid image file.";
  }
}