unamed

<form action="" method="post" enctype="multipart/form-data">
 <input type="file" name="myFile"/>
 <input type="submit" value="Upload"/>
</form>

<?php
define("UPLOAD_DIR", "images/");

if (!empty($_FILES['myFile']['name'])) {

  $fileType = exif_imagetype($_FILES['myFile']['tmp_name']);
  $allowed = array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG);
  if (!in_array($fileType, $allowed)) {
    $result = array('success' => 'false',
                    'result' => 'hanya diijinkan untuk meng-upload file gambar (gif, jpg, atau png)');
    echo json_encode($result);
  }

  else{
    $myFile = $_FILES['myFile'];
    $name = preg_replace("/[^A-Z0-9._-]/i", "_", $myFile['name']);
    $parts = pathinfo($name);
      $res = move_uploaded_file($myFile['tmp_name'], UPLOAD_DIR . $name);
      $result = array('success' => 'true',
                      'result' => "images/" . $_FILES['myFile']['name']);
      echo json_encode($result);
  }
}