PHP Notices: Undefined offset…

Hi Denis,

This is most likely an issue caused by another plugin on your site. The notices you are seeing can only be caused by code which checks the switch_to_user capability without passing in a user ID.

Can you try disabling the other plugins on your site one by one to determine which plugin is causing the notices to appear? Let me know which one it turns out to be.

John

Actually, I was able to resolve this issue by adding these PHP notice related conditions at the top of these functions.

Line 634 in public function filter_user_has_cap():

if ( !is_array($args) || empty($args[0]) || empty($args[1]) || empty($args[2]) ) { return $user_caps; }

Line 655 in public function filter_map_meta_cap():

if ( !is_array($args) || empty($args[0]) ) { return $required_caps; }

Let me know what you think…

Hi Denis,

Yes, changing that code will get rid of the error message, but it is simply hiding the problem rather than fixing it. One of the other plugins on your site is causing these notices.

If possible, it would be great if you could disable your other plugins one by one until the error goes away, and let me know which plugin is causing it.

John

I have same error, its plugin drag-drop-featured-image.

[13-Jan-2015 22:13:50 UTC] PHP Notice: Undefined offset: 0 in D:\WWW\Web\projects\wordpress\wp-content\plugins\user-switching\user-switching.php on line 655

[13-Jan-2015 22:13:50 UTC] PHP Stack trace:

[13-Jan-2015 22:13:50 UTC] PHP 1. {main}() d:\WWW\Web\projects\wordpress\wp-admin\plugins.php:0

[13-Jan-2015 22:13:50 UTC] PHP 2. require_once() d:\WWW\Web\projects\wordpress\wp-admin\plugins.php:10

[13-Jan-2015 22:13:50 UTC] PHP 3. require() D:\WWW\Web\projects\wordpress\wp-admin\admin.php:124

[13-Jan-2015 22:13:50 UTC] PHP 4. require_once() D:\WWW\Web\projects\wordpress\wp-admin\menu.php:269

[13-Jan-2015 22:13:50 UTC] PHP 5. do_action() D:\WWW\Web\projects\wordpress\wp-admin\includes\menu.php:149

[13-Jan-2015 22:13:50 UTC] PHP 6. call_user_func_array:{D:\WWW\Web\projects\wordpress\wp-includes\plugin.php:496}() D:\WWW\Web\projects\wordpress\wp-includes\plugin.php:496

[13-Jan-2015 22:13:50 UTC] PHP 7. WP_Drag_Drop_Featured_Image->add_admin_menu_page() D:\WWW\Web\projects\wordpress\wp-includes\plugin.php:496

[13-Jan-2015 22:13:50 UTC] PHP 8. add_options_page() D:\WWW\Web\projects\wordpress\wp-content\mu-plugins\drag-drop-featured-image\index.php:218

[13-Jan-2015 22:13:50 UTC] PHP 9. add_submenu_page() D:\WWW\Web\projects\wordpress\wp-admin\includes\plugin.php:1216

[13-Jan-2015 22:13:50 UTC] PHP 10. current_user_can() D:\WWW\Web\projects\wordpress\wp-admin\includes\plugin.php:1138

[13-Jan-2015 22:13:50 UTC] PHP 11. call_user_func_array:{D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:1380}() D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:1380

[13-Jan-2015 22:13:50 UTC] PHP 12. WP_User->has_cap() D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:1380

[13-Jan-2015 22:13:50 UTC] PHP 13. call_user_func_array:{D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:989}() D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:989

[13-Jan-2015 22:13:50 UTC] PHP 14. map_meta_cap() D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:989

[13-Jan-2015 22:13:50 UTC] PHP 15. apply_filters() D:\WWW\Web\projects\wordpress\wp-includes\capabilities.php:1360

[13-Jan-2015 22:13:50 UTC] PHP 16. call_user_func_array:{D:\WWW\Web\projects\wordpress\wp-includes\plugin.php:213}() D:\WWW\Web\projects\wordpress\wp-includes\plugin.php:213

[13-Jan-2015 22:13:50 UTC] PHP 17. user_switching->filter_map_meta_cap() D:\WWW\Web\projects\wordpress\wp-includes\plugin.php:213

These PHP notices are caused by a bug in the drag-drop-featured-image plugin. It’s using boolean true as a capability (rather than something like manage_options), which is incorrect.

I’ve just released an update to User Switching which avoids these PHP notices, even though the problem isn’t actually with User Switching itself.