replacing the_autor or make callback

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I’m looking a way tho change the the_author(); function in the loop,
I have post meta data with the name of the user who posted.

I need to do this:

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  • If the user is registered, show the_author();, but if isn’t show the data from the post meta.

Since the_author(), function doesn’t have a callback function I’m a little lost, maybe making a function?

The idea is replace the_author() in my theme.

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  1. There is no need to change the the_author() function itself. A simple conditional tag will do the trick. Example:

    <?php

/*** on your functions.php file ***/
function ifRegistered() {
    if(is_user_logged_in()) {
        the_author();
    } else {
        echo get_the_post_meta($post->ID, 'your_post_meta_key', true);
        // or anything else, of course
    }
}

/*** on the template you want to use the function  **/

// your HTML markup ...

    ifRegistered();

// more possible HTML ...

?>

    Hope that helps!

    EDIT: Updated the function.