UPLOAD AND AUTOMATIC RESIZE IMAGE

<?php
/* PHP Script
Upload Automatic Resize (Photo)
Created By Wildan Izzudin.
    (c) 2018 Underxploit
*/
error_reporting(0);
// --- Function Resize Image --- //
function resize($resource, $width, $height) {
         $new_width = 450; // New Width (px)
      $new_height = 450; // New Height (px)
         $new_layer = imagecreatetruecolor($new_width, $new_height); // New Layer

        imagecopyresampled($new_layer, $resource,0,0,0,0, $new_width, $new_height, $width, $height);

        return $new_layer;
}
// --- Function Random A-za-Z0-9 --- //
function acakadut($jumlah) {
    $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz';
    $strs = '';
for($i = 0; $i < $jumlah; $i++) {
      $pos = rand(0, strlen($str)-1);
      $strs .= $str{$pos};
}
  return $strs;
}

if(isset($_POST["upload"])) {
    if(is_array($_FILES)) {
        $gambar = $_FILES['image']['tmp_name'];
        $getimage = getimagesize($gambar);
        $path = "photo/"; // Set Directory
        $ext = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION);
        $type = $getimage[2];

 switch($type) {

 // --- Gambar PNG --- //
        case IMAGETYPE_PNG:
                $resource = imagecreatefrompng($gambar);
                $new_layer = resize($resource,$getimage[0],$getimage[1]);
                imagepng($new_layer,$path.acakadut(9).'.'.$ext);
                break;

 // --- Gambar GIF --- //
        case IMAGETYPE_GIF:
                $resource = imagecreatefromgif($gambar);
                $new_layer = resize($resource,$getimage[0],$getimage[1]);
                imagegif($new_layer,$path.acakadut(9).'.'.$ext);
                break;

// --- Gambar JPEG / JPG --- //
        case IMAGETYPE_JPEG:
                $resource = imagecreatefromjpeg($gambar);
                $new_layer = resize($resource,$getimage[0],$getimage[1]);
                imagejpeg($new_layer,$path.acakadut(9).'.'.$ext);
                break;

// --- If Invalid Type (Ekstension) --- //
            default:
                    echo "Yang Lu Upload Bukan Gambar Njeng -_-";
             exit;
             break;
    }
 }

if(@copy($path.acakadut(9).'.'.$ext)) {
            echo 'Gagal Njeng';
        } else {
            $photo = acakadut(9).'.'.$ext;
            echo('File Ter-Upload -> '.$photo);
      }
}
echo('<!DOCTYPE html>
<html>
<head>
<title>Upload Resize</title>
</head>
<body>

<div class="container">
<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="image" />
<input type="submit" name="upload" value="upload" />
</form>
</div>
</body>
</html>');
?>