wpsnoop Fatal error: Cannot redeclare poo_switch_autoupdate_callback()

If you are dealing with a WordPress issue where a PHP Function poo_switch_autoupdate_callback() was already declared it is most likely due to a plugin/theme conflict.

wpsnoop scanned and analyzed over 100,000 WordPress plugins and themes to find and locate potential conflicts including functions that share the same name.

This page has information on the 12 places where that function is declared and used in WordPress plugins and themes.

Note: Our database currently only taps into the free themes and plugins available in the publicly available WordPress plugins and themes, if your site uses paid plugins, themes or custom code there may be additional conflicts.


Our database has uncovered 12 different instances of potential conflicts where different plugins or themes share the function name.

Examples of this error include:

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/device-detector/perfopsone/functions.php:29)

This file is part of the WordPress plugin Device Detector and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/decalog/perfopsone/functions.php:29)

This file is part of the WordPress plugin DecaLog and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/htaccess-server-info-server-status/perfopsone/functions.php:29)

This file is part of the WordPress plugin Apache Status & Info and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/apcu-manager/perfopsone/functions.php:29)

This file is part of the WordPress plugin APCu Manager and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/ip-locator/perfopsone/functions.php:29)

This file is part of the WordPress plugin IP Locator and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/mailarchiver/perfopsone/functions.php:29)

This file is part of the WordPress plugin MailArchiver and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/traffic/perfopsone/functions.php:29)

This file is part of the WordPress plugin Traffic and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/oembed-manager/perfopsone/functions.php:29)

This file is part of the WordPress plugin oEmbed Manager and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/vibes/perfopsone/functions.php:29)

This file is part of the WordPress plugin Vibes and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/sessions/perfopsone/functions.php:29)

This file is part of the WordPress plugin Sessions and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/opcache-manager/perfopsone/functions.php:29)

This file is part of the WordPress plugin OPcache Manager and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare poo_switch_autoupdate_callback() (previously declared in wp-content/plugins/keys-master/perfopsone/functions.php:29)

This file is part of the WordPress plugin Keys Master and could be interacting with another theme or plugin and causing a fatal error.

The error occurs because two (or more) plugins that you are using are both trying to declare a function with the same name.