Apache 2.4：PHP文件未发送到浏览器

Question

I'm setting up a new site locally on a Windows machine for testing. In the document root, if I have an index.html it is served to the browser without problem. If I rename it index.php , the browser receives nothing. No error is raised server-side. I'm trying to understand why.

Vhosts

<VirtualHost *:80>
    DocumentRoot "C:\websites\learn"
    ServerName learn.loc

    LogLevel alert rewrite:trace2

    #PHP SETTINGS   
    php_value auto_prepend_file "C:\websites\learn\noop.php"
    php_value open_basedir "C:\websites\learn"

    <Directory "C:\websites\learn">    
      Options Indexes FollowSymLinks
      AllowOverride All
      Require all granted
    </Directory>   

</VirtualHost>

Here is the .htaccess file that resides in the document root:

RewriteEngine on
#point to javascript learning project
RewriteRule ^js   /javascript
RewriteRule ^js/(.*)   /javascript/$1

Here is the mod_rewrite log generated when I load learn.loc/javascript (this folder has an index.php file)

[initial] [perdir C:/websites/learn/] pass through C:/websites/learn/javascript/
[subreq] [perdir C:/websites/learn/] pass through C:/websites/learn/javascript/index.html
[subreq] [perdir C:/websites/learn/] pass through C:/websites/learn/javascript/index.htm
[subreq] [perdir C:/websites/learn/] pass through C:/websites/learn/javascript/index.php

Nothing is added to Apache or PHP error log; The browser itself receives status code 200 , along with the following response headers

Date:           "..."
Server:         "Apache/2.4.16 (Win32) PHP/5.6.23"
X-Powered-By:   "PHP/5.6.23"
Content-Length: "0"
Keep-Alive:     "timeout=5, max=100"
Connection:     "Keep-Alive"
Content-Type:   "text/html; charset=UTF-8"

The response body is an empty string. Like I said, if I rename the file to index.html the content (vanilla html file) is shown. What could be going on?

Answer 1

I figured it out. That was just me being careless. The problem was with this line from Vhosts config:

php_value auto_prepend_file "C:\websites\learn\noop.php"

More specifically, what was supposed to be a noop was really an execution killer.

noop.php

<?php
exit; // <- exits not just this script but all of PHP and returns to the browser

Once I removed the 2nd line, things were back in order. This also explains why renaming index.php to index.html got things working: it took PHP out of the loop entirely.