wpsnoop Fatal error: Cannot redeclare app_output_buffer()

If you are dealing with a WordPress issue where a PHP Function app_output_buffer() 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 11 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 11 different instances of potential conflicts where different plugins or themes share the function name.

Examples of this error include:

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/wpgraphicstudio/includes/misc-functions.php:1286)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/doliconnect/doliconnect.php:70)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/talentlms/shortcodes/reg_shortcodes.php:6)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/statly/statly-utm-tracking.php:113)

This file is part of the WordPress plugin Statly Advanced Analytics and Sales Funnel Tracking and could be interacting with another theme or plugin and causing a fatal error.

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/restposts/inc/mrp-settings.php:28)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/cab-fare-calculator/tblight.php:337)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/wp-pagseguro-payments/wp-pagseguro-payment.php:11)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/reservation/include/login.php:107)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/hide-admin-menu/menu-list.php:9)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/zeus-admin-theme/inc/hide-admin-menu/menu-list.php:10)

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

PHP Fatal error: Cannot redeclare app_output_buffer() (previously declared in wp-content/plugins/post-flagger/options.php:26)

This file is part of the WordPress plugin Post Flagger 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.