Cakephp App class code printing on the page and spl_autoload_register error - cakephp

Question

I have moved the CakePHP installation from my development server to production server (Config file and htaccess updated).
The production server was using an older version of PHP and I have requested the host to upgrade it. After they upgraded the PHP version, the site printing the php code on the webpage (Class : /lib/Cake/core/app) .. Also it displaying a fatal error on the bottom of the page, its below
Fatal error: Uncaught exception 'LogicException' with message 'Passed
array does not specify an existing static method (class 'App' not
found)' in /xxxxxxx/lib/Cake/bootstrap.php:154 Stack trace: #0
/xxxxxxx/lib/Cake/bootstrap.php(154): spl_autoload_register(Array) #1
/xxxxxxx/app/webroot/index.php(92): include('/xxxxxxx/pu...') #2
{main} thrown in /xxxxxxx/lib/Cake/bootstrap.php on line 154
Please help..

Answer 1

Have you checked the PHP version has actually changed, did you check (with phpinfo())?

Answer 2

Apparently, CakePHP was unable to find or load the App class (/xxxx/lib/Cake/core/App.php).
It's possible that paths have changed since the update, however, (if you're using CakePHP 2.3.1) line 134 of that same file uses this to load that file:
require CAKE . 'Core' . DS . 'App.php';
If the file was not present or could not be loaded, the script should stop at that point.
To check if your paths are correct, try to debug that path;
echo CAKE . 'Core' . DS . 'App.php'; die();
If that path is correct (my guess it is, otherwise the require should have stopped the script already as mentioned above), there is something wrong with the content of the App.php file. Maybe something corrupted the file (partial upload?) or incorrect line-endings caused PHP to interpret it incorrectly.
If the page is really showing the complete source of the App class, it may be possible you're (inadvertendly) using php 'short opening tags' and this has been disabled in the new configuration <? which may be cause, for example if a space is there is a space after the <? - <? PHP
More on short opening tags can be found here:
Are PHP short tags acceptable to use?