wpsnoop: fix Calendar plugin conflicts, errors & issues

When the plugin Calendar 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 learn which plugins and/or themes could be in conflict with Calendar.

Troubleshooting theme and plugin conflicts is easier when you know what Calendar 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

Get professional support for Calendar here

When you need professional help with WordPress: get help here

What does Calendar version 1.3.14 add to WordPress? Answers Here.

This is an automatically generated report - it is possible for Calendar to perform differently in your installation, previous versions before 1.3.14 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 1.3.14 of Calendar 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 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

Plugin Slug: calendar Internal ID: 11484 Addon Type: Plugin Version: 1.3.14 Price: Free Source: WordPress.org Files: 63 (930.08kB) Short Codes: [ / ] 1 Database Tables: 3 Function Count: 47 Code Review: Search Provit

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Which new files does Calendar add to WordPress?

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

The plugin Calendar added 63 new files when it was installed with WP-CLI in our WordPress test environment.

Type & Path	Size	Conflicts
wp-content/plugins/calendar/	930.08kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/calendar-admin.css	4.14kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/calendar-feed.php	3.50kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/calendar.php	131.65kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/calendar.pot	12.29kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/javascript.js	18.68kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/	565.42kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-ca_CA.mo	9.60kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-ca_CA.po	13.59kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-cs_CZ.mo	8.88kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-cs_CZ.po	12.87kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-cz_CZ.mo	8.38kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-cz_CZ.po	12.18kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-da_DK.mo	8.89kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-da_DK.po	12.88kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-de_DE.mo	10.94kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-de_DE.po	17.39kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-dk_DK.mo	8.88kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-dk_DK.po	13.44kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-es_ES.mo	9.25kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-es_ES.po	13.24kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-et_EE.mo	8.20kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-et_EE.po	12.21kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-fi_FI.mo	8.86kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-fi_FI.po	12.85kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-fr_FR.mo	9.78kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-fr_FR.po	13.78kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-gl_ES.mo	10.90kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-gl_ES.po	16.67kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-hu_HU.mo	8.24kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-hu_HU.po	12.23kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-it_IT.mo	8.91kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-it_IT.po	12.90kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-nb_NO.mo	6.74kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-nb_NO.po	12.08kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-nl_NL.mo	4.84kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-nl_NL.po	13.07kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-no_NB.mo	9.06kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-no_NB.po	13.07kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-no_NO.mo	8.03kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-no_NO.po	12.08kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-pl_PL.mo	11.30kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-pl_PL.po	16.75kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-pt_BR.mo	9.07kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-pt_BR.po	13.06kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-ru_RU.mo	10.98kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-ru_RU.po	14.98kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-se_SE.mo	9.03kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-se_SE.po	13.01kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-sk_SK.mo	8.99kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-sk_SK.po	13.04kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-sl_SI.mo	9.40kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-sl_SI.po	14.37kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-sv_SE.mo	9.53kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-sv_SE.po	13.53kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-tr_TR.mo	9.69kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/languages/calendar-tr_TR.po	13.79kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/readme.txt	20.57kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/screenshot-1.png	22.49kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/screenshot-2.png	6.73kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/screenshot-3.png	58.66kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/screenshot-4.png	29.97kB	No known conflicts with other themes or plugins.
wp-content/plugins/calendar/screenshot-5.png	55.98kB	No known conflicts with other themes or plugins.

Which new shortcodes does Calendar add to WordPress?

The plugin Calendar added 1 new shortcode when it was installed with WP-CLI in our WordPress test environment.

ShortCode		Known Plugin or Theme conflicts
[calendar]		The calendar shortcode has potential conflicts with at least 9 other plugins or themes.

Note: We have not yet checked to see if these shortcodes work as expected in pages, posts, sidebar widgets, or when set as the page title, in content, in the excert, in menus or anywhere else within a WordPress installation. A shortcode could produce errors due to parameters added when it is used, or if the plugin is updated and the format of the shortcode has changed.

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

Calendar created 3 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

After uninstalling and deleting Calendar using WP-CLI there were 3 database tables that still remained:

Table name	Status
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?

When Calendar was activated and loaded for the first time it created 1 new option in the wp_options table. Any known conflicts will be shown in red.

Option Name		Known Conflicts
calendar_version		The calendar_version option doesn't have any known conflicts with other themes or plugins.
1.3.9

During use Calendar may or may not create more options depending on how the plugin is configured and depending on which other themes and plugins are active in your specific hosting environment.

After disabling and deleting Calendar there were 2 options still present in the wp-options table:

calendar_version
recently_activated

Contact Calendar experts for help

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

Installing Calendar added 47 new function 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()
getcontrastyiq	1 conflict	Fatal error: Cannot redeclare getcontrastyiq()
grab_events	3 conflicts	Fatal error: Cannot redeclare grab_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()
calendar_check	0 conflicts	Fatal error: Cannot redeclare calendar_check()
calendar_config_edit	0 conflicts	Fatal error: Cannot redeclare calendar_config_edit()
calendar_ctwo	0 conflicts	Fatal error: Cannot redeclare calendar_ctwo()
calendar_deal_with_deleted_user	0 conflicts	Fatal error: Cannot redeclare calendar_deal_with_deleted_user()
calendar_draw_event	0 conflicts	Fatal error: Cannot redeclare calendar_draw_event()
calendar_draw_events	0 conflicts	Fatal error: Cannot redeclare calendar_draw_events()
calendar_dt_of_sun	0 conflicts	Fatal error: Cannot redeclare calendar_dt_of_sun()
calendar_edit	0 conflicts	Fatal error: Cannot redeclare calendar_edit()
calendar_events_display_list	0 conflicts	Fatal error: Cannot redeclare calendar_events_display_list()
calendar_events_edit_form	0 conflicts	Fatal error: Cannot redeclare calendar_events_edit_form()
calendar_feed_init_internal	0 conflicts	Fatal error: Cannot redeclare calendar_feed_init_internal()
calendar_feed_parse_request	0 conflicts	Fatal error: Cannot redeclare calendar_feed_parse_request()
calendar_feed_query_vars	0 conflicts	Fatal error: Cannot redeclare calendar_feed_query_vars()
calendar_load_text_domain	0 conflicts	Fatal error: Cannot redeclare calendar_load_text_domain()
calendar_manage_categories	0 conflicts	Fatal error: Cannot redeclare calendar_manage_categories()
calendar_minical	0 conflicts	Fatal error: Cannot redeclare calendar_minical()
calendar_minical_draw_events	0 conflicts	Fatal error: Cannot redeclare calendar_minical_draw_events()
calendar_minical_insert	0 conflicts	Fatal error: Cannot redeclare calendar_minical_insert()
calendar_next_link	0 conflicts	Fatal error: Cannot redeclare calendar_next_link()
calendar_np_of_day	0 conflicts	Fatal error: Cannot redeclare calendar_np_of_day()
calendar_permalink_prefix	0 conflicts	Fatal error: Cannot redeclare calendar_permalink_prefix()
calendar_prev_link	0 conflicts	Fatal error: Cannot redeclare calendar_prev_link()
calendar_setup_incomplete_warning	0 conflicts	Fatal error: Cannot redeclare calendar_setup_incomplete_warning()
calendar_shortcode_insert	0 conflicts	Fatal error: Cannot redeclare calendar_shortcode_insert()
calendar_time_cmp	0 conflicts	Fatal error: Cannot redeclare calendar_time_cmp()
calendar_todays_events	0 conflicts	Fatal error: Cannot redeclare calendar_todays_events()
calendar_todays_insert	0 conflicts	Fatal error: Cannot redeclare calendar_todays_insert()
calendar_upcoming_events	0 conflicts	Fatal error: Cannot redeclare calendar_upcoming_events()
calendar_upcoming_insert	0 conflicts	Fatal error: Cannot redeclare calendar_upcoming_insert()
widget_events_calendar	0 conflicts	Fatal error: Cannot redeclare widget_events_calendar()
widget_events_calendar_control	0 conflicts	Fatal error: Cannot redeclare widget_events_calendar_control()
widget_init_events_calendar	0 conflicts	Fatal error: Cannot redeclare widget_init_events_calendar()

Using Calendar 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 from the command line with WP-CLI

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

wp plugin install calendar

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

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

wp plugin install calendar --activate

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

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

wp plugin install calendar --force

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

wp plugin update calendar

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

wp plugin delete calendar

Where can you download earlier versions of Calendar?

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 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

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. Different versions of WordPress could implement the features of this plugin in slightly different ways as well.