Themes

Call to undefined function add_action() in plugin

Call to undefined function add_action() in plugin

If add_action comes up undefined, you're trying to run it outside of your theme's core files - basically, it's running without any of the processing WordPress is supposed to do before hitting your custom functions. This should be in your theme's functions. php file or within a plugin, as Colin pointed out.

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How to copy the all Wordpress media items to another custom plugin folder?
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Ajax post.php AJAX request not being called when publishing post
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