You have to call TopAuthor()
function in plugins_loaded
orinit
action. You are getting Fatal error: Uncaught Error: Call to undefined function wp_get_current_user()
because wp_get_current_user()
is a pluggable function. You can not call when your plugin is included. You have to wait for the action plugins_loaded
or init
. Call your TopAuthor()
function using init
or plugins_loaded
action.
init action:
add_action('init','do_stuff');
plugins_loaded action:
add_action('plugins_loaded','do_stuff');
Your function :
function do_stuff()
{
TopAuthor();
}
So full code of Your Plugin file look like:
<?php
/*
Plugin Name: Site Plugin for example.com
Description: Site specific code changes for example.com
*/
/* Start Adding Functions Below this Line */
/* Stop Adding Functions Below this Line */
// Register and load the widget
function wpb_load_widget() {
register_widget( 'wpb_widget' );
}
add_action( 'widgets_init', 'wpb_load_widget' );
// Creating the widget
class wpb_widget extends WP_Widget {
function __construct() {
parent::__construct(
// Base ID of your widget
'wpb_widget',
// Widget name will appear in UI
__('WPBeginner Widget', 'wpb_widget_domain'),
// Widget description
array( 'description' => __( 'Sample widget based on WPBeginner Tutorial', 'wpb_widget_domain' ), )
);
}
// Creating widget front-end
public function widget( $args, $instance ) {
$title = apply_filters( 'widget_title', $instance['title'] );
// before and after widget arguments are defined by themes
echo $args['before_widget'];
if ( ! empty( $title ) )
echo $args['before_title'] . $title . $args['after_title'];
// This is where you run the code and display the output
echo __( 'Hello, World!', 'wpb_widget_domain' );
echo $args['after_widget'];
}
// Widget Backend
public function form( $instance ) {
if ( isset( $instance[ 'title' ] ) ) {
$title = $instance[ 'title' ];
}
else {
$title = __( 'New title', 'wpb_widget_domain' );
}
// Widget admin form
?>
<p>
<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
</p>
<?php
}
// Updating widget replacing old instances with new
public function update( $new_instance, $old_instance ) {
$instance = array();
$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
return $instance;
}
} // Class wpb_widget ends here
//add_action('init','do_stuff');
add_action('plugins_loaded','do_stuff');
function do_stuff()
{
TopAuthor();
}
function TopAuthor() {
$contributor_ids = get_users( array(
'fields' => 'ID',
'orderby' => 'post_count',
'order' => 'DESC',
'who' => 'authors',
) );
foreach ( $contributor_ids as $contributor_id ) :
$post_count = count_user_posts( $contributor_id );
// Move on if user has not published a post (yet).
if ( ! $post_count ) {
continue;
}
?>
<div class="contributor">
<div class="contributor-info">
<div class="contributor-avatar"><?php echo get_avatar( $contributor_id, 132 ); ?></div>
<div class="contributor-summary">
<h2 class="contributor-name"><?php echo get_the_author_meta( 'display_name', $contributor_id ); ?></h2>
<p class="contributor-bio">
<?php echo get_the_author_meta( 'description', $contributor_id ); ?>
</p>
<a class="button contributor-posts-link" href="https://wordpress.stackexchange.com/questions/355429/<?php echo esc_url( get_author_posts_url( $contributor_id ) ); ?>">
<?php printf( _n( '%d Article', '%d Articles', $post_count, 'twentyfourteen' ), $post_count ); ?>
</a>
</div><!-- .contributor-summary -->
</div><!-- .contributor-info -->
</div><!-- .contributor -->
<?php
endforeach;
}
?>
I have tested it runs without any error.
Activated plugin : https://prnt.sc/qhu87l
Registerd widget : https://prnt.sc/qhu8bj