php - Code any where returns commented PHPcode

Question

When I put some PHP code in index.php, my PHP code does not show up in my browser (I use firefox). In Firefox's dev tool the PHP code

<?php include 'header.php'; ?>

becomes

 <!--?php include 'header.php';  ?-->

It is on Codeanywhere, HTML container on Ubuntu

Answer 1

试着先看看教程。http://docs.codeanywhere.com/quicktutorial.html