wpsnoop: fix Calendar Plus plugin conflicts, errors & issues

When the plugin Calendar Plus conflicts or throws a PHP error we hope wpsnoop can help you to fix the issue quickly.

Discover which shortcodes wp-options PHP functions database tables and files are created by Calendar Plus, plus learn which plugins and/or themes could be in conflict with Calendar Plus.

Troubleshooting theme and plugin conflicts is easier when you know what Calendar Plus leaves behind after uninstalling it from a WordPress installation, there is a list down below for your convenience.

Expert advice is recommended if you are not technically proficient with PHP, MySQL etc. View support options for Calendar Plus

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What does Calendar Plus version 1.2.4 add to WordPress? Answers Here.

This is an automatically generated report - it is possible for Calendar Plus to perform differently in your installation, previous versions before 1.2.4 may have created a different set of shortcodes, used different function names or could have created entirely different database tables to store settings and operate. This is not an exhaustive list but shows how version 1.2.4 of Calendar Plus behaves when installed and removed on a clean installation of WordPress.

We have not tested individual shortcodes, features or settings of this plugin but instead have concentrated on the potential for obvious errors and conflicts which can occur, if you need help with the plugin in your local installation you can get WordPress help and support for Calendar Plus by clicking here.

Our testing covered the free version of this plugin there may or may not be a paid version or premium version available for purchase that unlocks additional features and could behave in a slightly or very different manner.

Summary of WordPress plugin analysis: Calendar Plus

Plugin Slug: calendar-plus Internal ID: 11493 Addon Type: Plugin Version: 1.2.4 Price: Free Source: WordPress.org Files: 10 (347.37kB) Short Codes: [ / ] 0 Database Tables: 6 Function Count: 34 Code Review: Search Provit

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Which new files does Calendar Plus add to WordPress?

This section will populate with a table showing an icon, size and filepath.

The plugin Calendar Plus added 10 new files when it was installed with WP-CLI in our WordPress test environment.

Type & Path	Size	Conflicts
wp-content/plugins/calendar-plus/	347.37kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/calendar.php	101.98kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/calendar.pot	9.48kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/javascript.js	57.31kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/readme.txt	4.76kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/screenshot-1.png	22.49kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/screenshot-2.png	6.73kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/screenshot-3.png	58.66kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/screenshot-4.png	29.97kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar-plus/screenshot-5.png	55.98kB	No known conflicts with other themes or plugins.

Which new shortcodes does Calendar Plus add to WordPress?

The plugin Calendar Plus did not add any shortcodes when it was installed with WP-CLI in our WordPress test environment.

Which new database tables are created by the WordPress plugin Calendar Plus?

Calendar Plus created 6 new database tables when it was installed in our test environment:

Table name	Known Plugin or Theme conflicts
wp_calendar	Potential conflict with 2 other plugins
wp_calendar_categories	Potential conflict with 1 other plugin
wp_calendar_config	Potential conflict with 1 other plugin
calendar	The calendar table doesn't have any known conflicts with other themes or plugins.
calendar_categories	The calendar_categories table doesn't have any known conflicts with other themes or plugins.
calendar_config	The calendar_config table doesn't have any known conflicts with other themes or plugins.

After uninstalling and deleting Calendar Plus using WP-CLI there were 6 database tables that still remained:

Table name	Status
calendar	Orphan/Zombie
calendar_categories	Orphan/Zombie
calendar_config	Orphan/Zombie
wp_calendar	Orphan/Zombie
wp_calendar_categories	Orphan/Zombie
wp_calendar_config	Orphan/Zombie

Click the table name above for more information on what the orphan tables could mean to your WordPress installation and some tips on how to deal with it.

Which new options are added to the wp-options table by Calendar Plus?

None. There may be settings which have been changed by installing the Calendar Plus plugin however we do not yet track those changes.

What new PHP functions does Calendar Plus declare when it is active?

Installing Calendar Plus added 34 new functions to Wordpress at run-time. These functions are internal and generally aren't meant to be used except by developpers who wish to interface with the plugin to enhance or alter its behavior.

Function	Conflicts	Common Errors
calendar	4 conflicts	Fatal error: Cannot redeclare calendar()
calendar_add_javascript	3 conflicts	Fatal error: Cannot redeclare calendar_add_javascript()
calendar_insert	2 conflicts	Fatal error: Cannot redeclare calendar_insert()
calendar_menu	2 conflicts	Fatal error: Cannot redeclare calendar_menu()
calendar_month_comparison	2 conflicts	Fatal error: Cannot redeclare calendar_month_comparison()
calendar_wp_head	2 conflicts	Fatal error: Cannot redeclare calendar_wp_head()
calendar_year_comparison	2 conflicts	Fatal error: Cannot redeclare calendar_year_comparison()
check_calendar	1 conflict	Fatal error: Cannot redeclare check_calendar()
ctwo	1 conflict	Fatal error: Cannot redeclare ctwo()
deal_with_deleted_user	1 conflict	Fatal error: Cannot redeclare deal_with_deleted_user()
draw_event	2 conflicts	Fatal error: Cannot redeclare draw_event()
draw_events	2 conflicts	Fatal error: Cannot redeclare draw_events()
edit_calendar	1 conflict	Fatal error: Cannot redeclare edit_calendar()
edit_calendar_config	1 conflict	Fatal error: Cannot redeclare edit_calendar_config()
grab_events	3 conflicts	Fatal error: Cannot redeclare grab_events()
manage_categories	1 conflict	Fatal error: Cannot redeclare manage_categories()
next_link	3 conflicts	Fatal error: Cannot redeclare next_link()
np_of_day	1 conflict	Fatal error: Cannot redeclare np_of_day()
permalink_prefix	2 conflicts	Fatal error: Cannot redeclare permalink_prefix()
prev_link	2 conflicts	Fatal error: Cannot redeclare prev_link()
time_cmp	1 conflict	Fatal error: Cannot redeclare time_cmp()
todays_events	2 conflicts	Fatal error: Cannot redeclare todays_events()
upcoming_events	2 conflicts	Fatal error: Cannot redeclare upcoming_events()
widget_calendar_today	2 conflicts	Fatal error: Cannot redeclare widget_calendar_today()
widget_calendar_today_control	2 conflicts	Fatal error: Cannot redeclare widget_calendar_today_control()
widget_calendar_upcoming	2 conflicts	Fatal error: Cannot redeclare widget_calendar_upcoming()
widget_calendar_upcoming_control	2 conflicts	Fatal error: Cannot redeclare widget_calendar_upcoming_control()
widget_init_calendar_today	2 conflicts	Fatal error: Cannot redeclare widget_init_calendar_today()
widget_init_calendar_upcoming	2 conflicts	Fatal error: Cannot redeclare widget_init_calendar_upcoming()
wp_events_display_list	1 conflict	Fatal error: Cannot redeclare wp_events_display_list()
wp_events_edit_form	1 conflict	Fatal error: Cannot redeclare wp_events_edit_form()
calendax_insert	0 conflicts	Fatal error: Cannot redeclare calendax_insert()
todays_insert	0 conflicts	Fatal error: Cannot redeclare todays_insert()
upcoming_insert	0 conflicts	Fatal error: Cannot redeclare upcoming_insert()

Using Calendar Plus from the command line with WP-CLI

The following commands are provided for convenience and should only be used if you understand how WP-CLI works. These commands refer to a single WordPress instance and may need to be modified if you are working with a Multisite installation.

How to install Calendar Plus from the command line with WP-CLI

Navigate to the root of your WordPress installation and type the following command:

wp plugin install calendar-plus

How to activate Calendar Plus from the command line with WP-CLI

To immediately activate Calendar Plus after WP-CLI downloads the latest version you can use the following command:

wp plugin install calendar-plus --activate

How to reinstall Calendar Plus from the command line with WP-CLI

To force a reinstallation of Calendar Plus which overwrites the current plugin without asking for confirmation you can use the following command:

wp plugin install calendar-plus --force

How to update Calendar Plus to the latest version from the command line with WP-CLI

wp plugin update calendar-plus

How to delete Calendar Plus from the command line with WP-CLI

wp plugin delete calendar-plus

Where can you download earlier versions of Calendar Plus?

Whenever possible you should use the latest version of plugins and themes, however if you have recently updated and discovered that you need to install an earlier version you may be able to download other versions of Calendar Plus from the WordPress repository by visiting this link.

Please note that installing earlier versions of a theme or plugin is not generally a recommended course of action for most users and could re-introduce security, stability or other issues in Calendar Plus

About our testing enviroment

Tests were conducted using Apache 2.4.29, PHP 7.2 on Ubuntu 18.04, MySQL 5.7.33 and WordPress 5.9

It is very possible that different versions of PHP such as PHP 8.0, PHP 7.4, or PHP 7.3 could behave differently with Calendar Plus. Different versions of WordPress could implement the features of this plugin in slightly different ways as well.