Want to check if a shortcode already exists in WordPress? Ever since WordPress 3.6.0 in 2013 you can easily check to see if a shortcode has been registered in WordPress with the shortcode_exists function.
This can be useful if you’re adding functionality to your theme’s functions.php file or creating a specific plugin for your site. Since you don’t want to overwrite existing shortcodes it’s best to check if it already exists before running.
Additionally this may be useful to check if a shortcode exists before executing a do_shortcode function in your code.
This is also ideal if you’re removing a plugin and you want to catch instances of an existing shortcode on your site without resulting in an error.
For example say you had a plugin using a [modula] shortcode but have removed it to use Envira’s shortcode [envira-gallery]. If you’re a developer you can use this snippet to have [envira-gallery] used everytime [modula] is referenced and correctly change the variables as well.
I hope this quick tip was useful! If you have any WordPress development questions let me know in the comments below.