Upload multiple image files and attach them with mail

[ximixi]

Hi everyone. I am new to PHP and i am trying to upload multiple images using a form. I need to send those images to the admin of the site via mail. Can anyone help me and show me a little demo? Here is the code of form for start

<form enctype="multipart/form-data" id='cartform' name='cartform' method='POST' action='<?php echo home_url('/submit-order');?>'>
<div>
  <input name="userimage[]" type="file" multiple accept="image/*">
  <input type='submit' name='submit1' value='Proceed'>
</div>
</form>

I need want to get the images on next page and use them as attachment with mail to admin. I am using Wordpress