Wordpress errors

Blank page cache issue

Fatal error: require_once() [function.require]: Failed opening required '/htdocs/wp-content\plugins/quick-cache-pro/includes/share.php' (include_path='.:/usr/share/php:/usr/services/vux/lib/php') in /htdocs/wp-content/advanced-cache.php on line 326

Solution:

Comment out the following lines of code in wp-settings.php:

if ( WP_CACHE )

WP_DEBUG ? include( WP_CONTENT_DIR . '/advanced-cache.php' ) : @include( WP_CONTENT_DIR . '/advanced-cache.php' );

Remove advanced-cache.php from wp-content folder

Redeclare get_temp_dir() error

Error: Fatal Error: Cannot redeclare get_temp_dir() (previously declared in /home/public_html/wp-includes/functions.php:2160) in /home/public_html/wp-admin/includes/file.php on line 189

Solution: Reinstall all WP core files. To keep the plugins, themes and content. Just deleted WP-Admin and uploaded the fresh version and the same for the functions.php.

Source: https://wordpress.org/support/topic/upgrade-from-wp-314-to-wp-32-admin-error-cannot-redeclare-get_temp_dir

Blank Page

If you see a blank page it could be because the installer had wrong info or something is missing in htacces, this default htaccess could also help with people logging and wp permalinks working correctly

WP-Config Editing

There is several other things you can edit in the config file but for this purpose or any database errors you would want to look for the following things within your wp-config file.

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('DB_NAME', 'Database-name');

/** MySQL database username */
define('DB_USER', 'Database-username');

/** MySQL database password */
define('DB_PASSWORD', 'Db-password');

/** MySQL hostname */
// Depending on your host you may have a different local host name or a remote hostname that you would need to provide
define('DB_HOST', 'localhost');

Default Htaccess

make sure the following is in the htaccess file in the same folder as the folder with wordpress in it. Also depending on the version you may require different information in the htaccess file which you can refer to the source link. Source: http://codex.wordpress.org/htaccess

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Manual Theme Changing

Source: http://docs.appthemes.com/tutorials/how-to-change-wordpress-themes-directly-from-the-database/ Another part of the issue is changing the template manually to something else.

This first part checks for the theme

SELECT *
FROM wp_options
WHERE option_name = 'template'
OR option_name = 'stylesheet'
OR option_name = 'current_theme';

Then you can use that information to then change the template by using this following command.

UPDATE wp_options SET option_value = 'Template Name' WHERE option_name = 'template';
UPDATE wp_options SET option_value = 'templatename' WHERE option_name = 'stylesheet';
UPDATE wp_options SET option_value = 'templatename' WHERE option_name = 'current_theme';

Worst case scenario you set them back to a default template

UPDATE wp_options SET option_value = 'Twenty Eleven' WHERE option_name = 'template';
UPDATE wp_options SET option_value = 'twentyeleven' WHERE option_name = 'stylesheet';
UPDATE wp_options SET option_value = 'twentyeleven' WHERE option_name = 'current_theme';

Site and Home URL configurations in config

define('WP_SITEURL', 'http://example.com/wordpress');
define('WP_HOME', 'http://example.com/wordpress');

Source: https://wordpress.org/support/topic/defining-wordpress-url-in-wp-configphp

wp_options garbage

This can help killing the garbage that can build up in wp_options

DELETE FROM `wp_options` WHERE `option_name` LIKE ('%\_transient\_%')

source: http://stackoverflow.com/questions/10422574/can-i-remove-transients-in-the-wp-options-table-of-my-wordpress-install

Hiding login url

Now this option name may change based on the plugin but you will want to search the db and select wp_options to search for where the admin or login page is

I found the option in this column value => itsec_hide_backend where it showed the login slug

Is This directory Writable (Upload Error)

When trying to add new files to the media library you may see an error noting a new folder could not be created and asking if the parent directory is writable. The issue is most likely that the folder path is wrong for the uploads directory. Go to /wp-admin, login, then go to /options.php. Navigate to the upload_path and make sure the full server path o the /uploads directory is listed.