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The following script creates a server-side upload handler in PHP suitable for use with Textbox.io.

Please note that this script is provided for your reference - you'll need to update this as necessary for your application.

  File Modified
File postAcceptor.php Jun 05, 2015 by Gavin Douglas

postAcceptor.php
<?php
  /*******************************************************
   * Only these origins will be allowed to upload images *
   ******************************************************/
  $accepted_origins = array("http://localhost", "http://192.168.1.1", "http://example.com");
 
  /*********************************************
   * Change this line to set the upload folder *
   *********************************************/
  $imageFolder = "images/";
 
  reset ($_FILES);
  $temp = current($_FILES);
  if (is_uploaded_file($temp['tmp_name'])){
    if (isset($_SERVER['HTTP_ORIGIN'])) {
      // same-origin requests won't set an origin. If the origin is set, it must be valid.
      if (in_array($_SERVER['HTTP_ORIGIN'], $accepted_origins)) {
        header('Access-Control-Allow-Origin: ' . $_SERVER['HTTP_ORIGIN']);
      } else {
        header("HTTP/1.0 403 Origin Denied");
        return;
      }
    }
     
    /*
      If your script needs to receive cookies, set images.upload.credentials:true in
      the Textbox.io configuration and enable the following two headers.
    */
    // header('Access-Control-Allow-Credentials: true');
    // header('P3P: CP="There is no P3P policy."');
    // Sanitize input
    if (preg_match("/([^\w\s\d\-_~,;:\[\]\(\).])|([\.]{2,})/", $temp['name'])) {
	    header("HTTP/1.0 500 Invalid file name.");
		return;
    }
	// Verify extension
    if (!in_array(strtolower(pathinfo($temp['name'], PATHINFO_EXTENSION)), array("gif", "jpg", "png"))) {
	    header("HTTP/1.0 500 Invalid extension.");
		return;
    }
    // Accept upload if there was no origin, or if it is an accepted origin
    $filetowrite = $imageFolder . $temp['name'];
    move_uploaded_file($temp['tmp_name'], $filetowrite);
 
    // Respond to the successful upload with JSON.
    // Use a location key to specify the path to the saved image resource.
    // { location : '/your/uploaded/image/file'}
    echo json_encode(array('location' => $filetowrite));
  } else {
    // Notify Textbox.io editor that the upload failed
    header("HTTP/1.0 500 Server Error");
  }
?>
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