Joomla admin blank screen on most pages

[Krazzme3]

I have had an issue arise when the Joomla admin is accessible but we are unable to navigate in it to edit, eg we cant open an article or module to edit, a blank page is the result.

This is new occurrence after no updates occurring to plugins or components, after getting error reporting we traced the issue appears to be this file.

Fatal error: Cannot redeclare request_url_data() (previously declared in /home/****/public_html/administrator/includes/defines.php:30) in /home/****/public_html/includes/defines.php on line 68

We are in the process of upgrading to J3.x however this popped up yesterday

Help appreciated

[pe7er]

A complete blank page is usually an indication of a PHP error while PHP error reporting is switched off.
See similar topic: http://forum.joomla.org/viewtopic.php?f ... 0#p3339615

[Krazzme3]

Peter thanks...

I have already turned reporting on thats where I got \ that error from plus these, however as nothing has been touched on this site other than article edits I cant understand why all of a sudden this happened out of the blue.

Here are the reported errors, non of these plugins have been upgraded or changed

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/admintools/admintools/core.php on line 33

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/admintools/admintools/pro.php on line 37

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/nonumberelements/nonumberelements.php on line 18

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/nonumberelements/nonumberelements.php on line 21

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/nonumberelements/nonumberelements.php on line 45

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/slider/slider.php on line 47

Strict Standards: Only variables should be assigned by reference in /home/****/public_html/plugins/system/slider/slider.php on line 50

[pe7er]

however as nothing has been touched on this site other than article edits I cant understand why all of a sudden this happened out of the blue.

Here are the reported errors, non of these plugins have been upgraded or changed

I'll bet that your hosting company has updated their PHP version from 5.3.x or lower to PHP 5.4 or higher.

The software that is giving the Strict Standards warnings is outdated and was probably written for PHP 5.3 or earlier.
You are probably using PHP 5.4 or higher, which is more strict about code style & how variables are declared & used.

Solution: upgrade (after making a full backup) Joomla to 3.4.5 and update all 3rd party extensions.
Trying to solve the errors in the old versions is a waste of your time...