Split large XML files into smaller pieces in php

How can i split a large xml file into smaller ones more exactely i want one xml file for each node and the name of the xml file to be given by a child fron node.

XML file has the below structure

<Products>
  <Products>
    <ID>ID</ID>
    <Name>Product_Name</Name>
    <Qty>qty</Qty>
    <Brand>Brand</Brand>
     ......
  </Product>
  <Product>
    <ID>ID</ID>
    <Name>Product_Name</Name>
    <Qty>qty</Qty>
    <Brand>Brand</Brand>
     ......
  </Product>
  <Product>
   ........
  </Product>
</Products>

I have searched over the internet and i have found only c# solutions and i dont know c#

So i need to have one XML file for each product and the name of the xml file is given by the value from <ID></ID>