gistfile1.php

<?php
/**
 * Caching Widgets with transients
 * 
 * @link http://speckyboy.com/2011/12/14/website-speed-part-3-caching-wordpress/
 * /

class show_ak_events_Widget  extends WP_Widget {
    function show_ak_events_Widget() {
            /* Widget settings. */
            $widget_ops = array( 'classname' => 'ak-events', 'description' => 'Shows events in a table' );
            /* Widget control settings. */
            $control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'ak-events' );
            /* Create the widget. */
            $this->WP_Widget( 'ak-events', 'Show Events', $widget_ops, $control_ops );
    }
 
    function widget( $args, $instance ) {
            extract( $args );
            // get cache if it exists
            //  $widget_id comes from the widget $args->widget_id and is the widgets unique ID
            $output = get_transient('events'.$widget_id);
 
            // if no $output do stuff inside this if statement
            if ( $output === false ) {
                 // set the title variable
                 $title = apply_filters('widget_title', $instance['title'] );
 
                // standard opening of widget
                $output = $before_widget;
 
                // if a title exists add it to the top of the widget
                $output .= ( !empty( $title ) )? $before_title . $title . $after_title : "" ;
 
                // Create query arguments for WP_Query to use
                $widgetargs =  array( 'posts_per_page'=>'-1',
                                       'post_type'=>'ak_events',
                                       'post_status'=>'publish'
                                       );
 
                // WP_Query sets up a loop query
                $query = new WP_Query( $widgetargs );
 
 
                // create the opening table and top row
                $output .= "<table><tr><th>Event Name</th><th>Information</th></tr>";
 
                // If the WP_Query has results send them through the loop
                if ($query->have_posts()) : while ($query->have_posts()) : $query->the_post();
                    $output .= "<tr><td>" . get_the_title() . "</td><td> " . get_the_excerpt() . " </td></tr>";
                endwhile;endif;
 
                // close the table
                $output .= "</table>";
 
                // close widget properly
                $output .= $after_widget;
 
                // save $output as a transient and set it to be 60 seconds * 5 = 5 minutes.
                //
                set_transient( 'events'.$widget_id, $output, 60*5 );
            }
 
            echo $output;
 
    }
 
    function update( $new_instance, $old_instance ) {
            // save form data
            $instance = $old_instance;
            $instance['title'] = $new_instance['title'];
 
            // delete the transient so the new title setting is used
            delete_transient('events'.$this->id);
    return $instance;
    }
 
    function form( $instance ) {
         $defaults = array(
           'title'=>''
       );
        $instance = wp_parse_args( (array) $instance, $defaults ); ?>
         <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>">
                <?php _e('Title:','proving-ground'); ?>
            </label>
            <input id="<?php echo $this->get_field_id( 'title' ); ?>"
                      name="<?php echo $this->get_field_name( 'title' ); ?>"
                      value="<?php echo $instance['title']; ?>" style="width:95%" />
        </p>
 
 
        <?php
     }
}