title: Comparing 2 XML Files using PHP
body: <p>I want to compare 2 big xml files and retrieve the differences. Like ExamXML and DiffDog do. The solution I found was cycling through all child nodes of each file simultaneously and check if they are equal. But I have no idea how to achieve that... How can I loop through all child nodes and their properties? How can I check if the first element of the first file is equal to the first element of the second file, the second element of the first file is equal to the second element of the second file and so on?</p>
  
  <p>Do yo have a better idea to compare 2 xml files?</p>