widgets.php

<?php
// Read me later widget
class RML_Widget extends WP_Widget {	
	
    function __construct() {
        parent::__construct(
            'rml_widget', // Base ID
            __( 'Read Me Later', 'text_domain' ), // Name
            array( 'classname' => 'rml_widgt', 'description' => __( 'Read Me Later widget for displaying saved posts', 'text_domain' ), ) // Args
        );
    }

	public function form( $instance ) {
        if ( isset( $instance['title'] ) ) {
            $title = $instance['title'];
        } else {
            $title = __( 'Read Me Later Posts', 'text_domain' );
        }
        ?>
        <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
    }

	public function update( $new_instance, $old_instance ) {
        $instance          = array();
        $instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
 
        return $instance;
    }
	
	public function widget( $args, $instance ) {
		
		$title = apply_filters( 'widget_title', $instance['title'] );
 
        echo $args['before_widget'];
        if ( ! empty( $title ) ) {
            echo $args['before_title'] . $title . $args['after_title'];
        }

		echo '<div class="rml_contents">';
		
		function limit_words($string, $word_limit) {
			$words = explode(' ', $string);
			return implode(' ', array_slice($words, 0, $word_limit));
		}
		
		$ids = get_user_meta( wp_get_current_user()->ID, 'rml_post_ids', true );
		
		// Query read me later posts
		$args = array( 
			'post_type' => 'post',
			'orderby' => 'DESC', 
			'posts_per_page' => -1, 
			'numberposts' => -1,
			'post__in' => $ids
		);
		
		$rmlposts = get_posts( $args );
		if( $ids ) :
			global $post;
			foreach ( $rmlposts as $post ) :
				setup_postdata( $post );
				$img = wp_get_attachment_image_src( get_post_thumbnail_id() ); 
				?>			
				<div class="rml_posts">					
					<div class="rml_post_content">
						<h5><a href="<?php echo get_the_permalink(); ?>"><?php the_title(); ?></a></h5>
						<p><?php echo limit_words(get_the_excerpt(), '20'); ?></p>
					</div>
					<img src="<?php echo $img[0]; ?>" alt="<?php echo get_the_title(); ?>" class="rml_img">					
				</div>
			<?php 
			endforeach;
			wp_reset_postdata();
		else :
		echo '<p>You have no posts saved now.</p>';
		endif;		
		
		echo '</div>';
		
		echo $args['after_widget'];
	}
}
add_action( 'widgets_init', function(){ register_widget( 'RML_Widget' ); } );
?>