wordpress plugin -> Call to undefined function wp_get_current_user()

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Apparently this is happening because the file /wp-includes/pluggable which contains the function doesn’t get loaded until after the plugins are loaded.

Indeed it is. So wrap whichever thing you’re doing in a function, and hook it onto the plugins_loaded or init hook. (see the wp-settings.php file)

Example:

add_action('init','do_stuff');
function do_stuff(){
  $current_user = wp_get_current_user();
  // ...
}

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