显然是因为包含插件的功能的文件/wp-includes/pluggable直到插件被加载后才会被加载.

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

的确如此.因此，将您正在执行的任何操作都包装在函数中，然后将其挂接到plugins_loaded或init钩上. (请参阅wp-settings.php文件)

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)

示例:

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