wpsnoop: fix QR Barcode plugin conflicts, errors & issues

When the plugin QR Barcode 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 QR Barcode, plus learn which plugins and/or themes could be in conflict with QR Barcode.

Troubleshooting theme and plugin conflicts is easier when you know what QR Barcode 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 QR Barcode

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What does QR Barcode version 1.0 add to WordPress? Answers Here.

This is an automatically generated report - it is possible for QR Barcode to perform differently in your installation, previous versions before 1.0 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 1.0 of QR Barcode 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 QR Barcode 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: QR Barcode

Plugin Slug: qr-barcode Internal ID: 56826 Addon Type: Plugin Version: 1.0 Price: Free Source: WordPress.org Files: 8 (68.36kB) Short Codes: [ / ] 1 Database Tables: 0 Function Count: 4 Code Review: Search Provit

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Which new files does QR Barcode add to WordPress?

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

The plugin QR Barcode added 8 new files when it was installed with WP-CLI in our WordPress test environment.

Type & Path	Size	Conflicts
wp-content/plugins/qr-barcode/	68.36kB	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/js/	2.12kB	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/js/customcodes.js	611.00B	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/js/qrcode_icon.jpg	1.53kB	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/qr-barcode.php	1.29kB	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/readme.txt	942.00B	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/screenshot-1.jpg	24.61kB	No known conflicts with other themes or plugins.
wp-content/plugins/qr-barcode/screenshot-2.jpg	39.42kB	No known conflicts with other themes or plugins.

Which new shortcodes does QR Barcode add to WordPress?

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

ShortCode		Known Plugin or Theme conflicts
[qrcode]		The qrcode shortcode has potential conflicts with at least 14 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 QR Barcode?

QR Barcode did not create any new database tables when it was installed. It is possible that the plugin creates new database tables after an initial setup or configuration or after some period of use.

Which new options are added to the wp-options table by QR Barcode?

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

What new PHP functions does QR Barcode declare when it is active?

Installing QR Barcode added 4 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
add_button	16 conflicts	Fatal error: Cannot redeclare add_button()
add_plugin	31 conflicts	Fatal error: Cannot redeclare add_plugin()
register_button	37 conflicts	Fatal error: Cannot redeclare register_button()
writeqrbarcode	0 conflicts	Fatal error: Cannot redeclare writeqrbarcode()

Using QR Barcode 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 QR Barcode from the command line with WP-CLI

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

wp plugin install qr-barcode

How to activate QR Barcode from the command line with WP-CLI

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

wp plugin install qr-barcode --activate

How to reinstall QR Barcode from the command line with WP-CLI

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

wp plugin install qr-barcode --force

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

wp plugin update qr-barcode

How to delete QR Barcode from the command line with WP-CLI

wp plugin delete qr-barcode

Where can you download earlier versions of QR Barcode?

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 QR Barcode 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 QR Barcode

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