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Yme Brugts1,953 Points
WP_PLUGIN_URL is used but this should not be used according to WP codex
It sounds like using "WP_PLUGIN_URL" in a plugin was a bad thing to learn to me.
Also from here: "https://codex.wordpress.org/Determining_Plugin_and_Content_Directories"
"WordPress makes use of the following constants when determining the path to the content and plugin directories. These should not be used directly by plugins or themes, but are listed here for completeness."
Now I wonder what other bad things I learned without me knowing it.
edit: I'm using it from a variable so maybe it is okay? Can someone clarify? Thanks