Can you use add_filter() inside other function?

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I’m new to WordPress, and currently developing my first plugin and currently having difficulties.

How I can insert the add_filter action inside my submit function? I want the add_filter action to process after the user click the submit button.

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I have try this but it didn’t work. 

if(isset($_POST['btn_submit'])) {

    function addContent($content = '') {            
        $content .= "My content";

        return $content;
    }

    add_filter('the_content', 'addContent');
}

Any help would be greatly appreciated. Thanks!

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3 comments

  1. I think what you’re ACTUALLY looking to do is to apply_filters(). add_filter() registers a new filter, whereas apply_filters() does the filters that have been registered.

    If that’s not what you’re looking to do, then you need to be aware that add_filter() needs to be run every time you want the filter applied. This allows plugins to be removed without having to unregister all their filters and generally keeps a wordpress install pretty clean…it also helps with security. A better question might encompass a broader scope, where you state what you’re trying to do, rather than having us try and troubleshoot your implementation of it.

  2. You can also write in the following way:

        function addContent($content = '') {    
     $content .= "My content";    
     return $content; 
    }

   if(isset($_POST['btn_submit'])) {
    add_filter('the_content', 'addContent'); }