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Editing: authors.php

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<?php
/**
 * Disable direct access/execution to/of the widget code.
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Widget to display blog authors with avatars and recent posts.
 *
 * Configurable parameters include:
 * 1. Whether to display authors who haven't written any posts
 * 2. The number of posts to be displayed per author (defaults to 0)
 * 3. Avatar size
 *
 * @since 4.5.0
 */
class Jetpack_Widget_Authors extends WP_Widget {
	public function __construct() {
		parent::__construct(
			'authors',
			/** This filter is documented in modules/widgets/facebook-likebox.php */
			apply_filters( 'jetpack_widget_name', __( 'Authors', 'jetpack' ) ),
			array(
				'classname' => 'widget_authors',
				'description' => __( 'Display blogs authors with avatars and recent posts.', 'jetpack' ),
				'customize_selective_refresh' => true,
			)
		);

if ( is_active_widget( false, false, $this->id_base ) || is_active_widget( false, false, 'monster' ) || is_customize_preview() ) {
			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_style' ) );
		}

add_action( 'publish_post', array( __CLASS__, 'flush_cache' ) );
		add_action( 'deleted_post', array( __CLASS__, 'flush_cache' ) );
		add_action( 'switch_theme', array( __CLASS__, 'flush_cache' ) );
	}

/**
	 * Enqueue stylesheet to adapt the widget to various themes.
	 *
	 * @since 4.5.0
	 */
	function enqueue_style() {
		wp_register_style( 'jetpack-authors-widget', plugins_url( 'authors/style.css', __FILE__ ), array(), '20161228' );
		wp_enqueue_style( 'jetpack-authors-widget' );
	}

public static function flush_cache() {
		wp_cache_delete( 'widget_authors', 'widget' );
		wp_cache_delete( 'widget_authors_ssl', 'widget' );
	}

public function widget( $args, $instance ) {
		$cache_bucket = is_ssl() ? 'widget_authors_ssl' : 'widget_authors';

if ( '%BEG_OF_TITLE%' != $args['before_title'] ) {
			if ( $output = wp_cache_get( $cache_bucket, 'widget') ) {
				echo $output;
				return;
			}

ob_start();
		}

$instance = wp_parse_args( $instance, array( 'title' => __( 'Authors', 'jetpack' ), 'all' => false, 'number' => 5, 'avatar_size' => 48 ) );
		$instance['number'] = min( 10, max( 0, (int) $instance['number'] ) );

// We need to query at least one post to determine whether an author has written any posts or not
		$query_number = max( $instance['number'], 1 );

$default_excluded_authors = array();
		/**
		 * Filter authors from the Widget Authors widget.
		 *
		 * @module widgets
		 *
		 * @since 4.5.0
		 *
		 * @param array $default_excluded_authors Array of user ID's that will be excluded
		 */
		$excluded_authors = apply_filters( 'jetpack_widget_authors_exclude', $default_excluded_authors );

$authors = get_users( array(
			'fields' => 'all',
			'who' => 'authors',
			'exclude' => (array) $excluded_authors,
		) );

echo $args['before_widget'];
		/** This filter is documented in core/src/wp-includes/default-widgets.php */
		$title = apply_filters( 'widget_title', $instance['title'] );
		echo $args['before_title'] . esc_html( $title ) . $args['after_title'];
		echo '<ul>';

$default_post_type = 'post';
		/**
		 * Filter types of posts that will be counted in the widget
		 *
		 * @module widgets
		 *
		 * @since 4.5.0
		 *
		 * @param string|array $default_post_type type(s) of posts to count for the widget.
		 */
		$post_types = apply_filters( 'jetpack_widget_authors_post_types', $default_post_type );

foreach ( $authors as $author ) {
			$r = new WP_Query( array(
				'author'         => $author->ID,
				'posts_per_page' => $query_number,
				'post_type'      => $post_types,
				'post_status'    => 'publish',
				'no_found_rows'  => true,
				'has_password'   => false,
			) );

if ( ! $r->have_posts() && ! $instance['all'] ) {
				continue;
			}

echo '<li>';

// Display avatar and author name
			if ( $r->have_posts() ) {
				echo '<a href="' . get_author_posts_url( $author->ID ) . '">';

if ( $instance['avatar_size'] > 1 ) {
					echo ' ' . get_avatar( $author->ID, $instance['avatar_size'], '', true ) . ' ';
				}

echo '<strong>' . esc_html( $author->display_name ) . '</strong>';
				echo '</a>';
			}
			else if ( $instance['all'] ) {
				if ( $instance['avatar_size'] > 1 ) {
					echo get_avatar( $author->ID, $instance['avatar_size'], '', true ) . ' ';
				}

echo '<strong>' . esc_html( $author->display_name ) . '</strong>';
			}

if ( 0 == $instance['number'] ) {
				echo '</li>';
				continue;
			}

// Display a short list of recent posts for this author

if ( $r->have_posts() ) {
				echo '<ul>';

while ( $r->have_posts() ) {
					$r->the_post();
					echo '<li><a href="' . get_permalink() . '">';

if ( get_the_title() ) {
						echo get_the_title();
					} else {
						echo get_the_ID();
					}

echo '</a></li>';
				}

echo '</ul>';
			}

echo '</li>';
		}

echo '</ul>';
		echo $args['after_widget'];

wp_reset_postdata();

if ( '%BEG_OF_TITLE%' != $args['before_title'] ) {
			wp_cache_add( $cache_bucket, ob_get_flush(), 'widget' );
		}

/** This action is documented in modules/widgets/gravatar-profile.php */
		do_action( 'jetpack_stats_extra', 'widget_view', 'authors' );
	}

public function form( $instance ) {
		$instance = wp_parse_args( $instance, array( 'title' => '', 'all' => false, 'avatar_size' => 48, 'number' => 5 ) );

?>
		<p>
			<label>
				<?php _e( 'Title:', 'jetpack' ); ?>
				<input class="widefat" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>" />
			</label>
		</p>
		<p>
			<label>
				<input class="checkbox" type="checkbox" <?php checked( $instance['all'] ); ?> name="<?php echo $this->get_field_name( 'all' ); ?>" />
				<?php _e( 'Display all authors (including those who have not written any posts)', 'jetpack' ); ?>
			</label>
		</p>
		<p>
			<label>
				<?php _e( 'Number of posts to show for each author:', 'jetpack' ); ?>
				<input style="width: 50px; text-align: center;" name="<?php echo $this->get_field_name( 'number' ); ?>" type="text" value="<?php echo esc_attr( $instance['number'] ); ?>" />
				<?php _e( '(at most 10)', 'jetpack' ); ?>
			</label>
		</p>
		<p>
			<label>
				<?php _e( 'Avatar Size (px):', 'jetpack' ); ?>
				<select name="<?php echo $this->get_field_name( 'avatar_size' ); ?>">
					<?php foreach( array( '1' => __( 'No Avatars', 'jetpack' ), '16' => '16x16', '32' => '32x32', '48' => '48x48', '96' => '96x96', '128' => '128x128' ) as $value => $label ) { ?>
						<option value="<?php echo esc_attr( $value ); ?>" <?php selected( $value, $instance['avatar_size'] ); ?>><?php echo esc_html( $label ); ?></option>
					<?php } ?>
				</select>
			</label>
		</p>
		<?php
	}

/**
	 * Updates the widget on save and flushes cache.
	 *
	 * @param array $new_instance
	 * @param array $old_instance
	 * @return array
	 */
	public function update( $new_instance, $old_instance ) {
		$new_instance['title'] = strip_tags( $new_instance['title'] );
		$new_instance['all'] = isset( $new_instance['all'] );
		$new_instance['number'] = (int) $new_instance['number'];
		$new_instance['avatar_size'] = (int) $new_instance['avatar_size'];

Jetpack_Widget_Authors::flush_cache();

return $new_instance;
	}
}

add_action( 'widgets_init', 'jetpack_register_widget_authors' );
function jetpack_register_widget_authors() {
	register_widget( 'Jetpack_Widget_Authors' );
};

Editing: authors.php

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