gdk/class/widget_cache.php

<?php

class Auto_Widget_cache {
    public $cache_time = 18000;
    /*
    MINUTE_IN_SECONDS = 60 seconds
    HOUR_IN_SECONDS = 3600 seconds
    DAY_IN_SECONDS = 86400 seconds
    WEEK_IN_SECONDS = 604800 seconds
    YEAR_IN_SECONDS = 3153600 seconds
    */
    function __construct() {
        add_filter('widget_display_callback', array( $this,'_cache_widget_output' ) , 10, 3);
        add_action('in_widget_form', array( $this, 'in_widget_form' ) , 5, 3);
        add_filter('widget_update_callback', array( $this, 'widget_update_callback') , 5, 3);
    }
    function get_widget_key($i, $a) {
        return 'WC-' . md5(serialize(array($i, $a)));
    }
    function _cache_widget_output($instance, $widget, $args) {
        if (false === $instance) return $instance;
        if (isset($instance['wc_cache']) && $instance['wc_cache'] == true) return $instance;
        $timer_start = microtime(true);
        $transient_name = $this->get_widget_key($instance, $args);
        if (false === ($cached_widget = get_transient($transient_name))) {
            ob_start();
            $widget->widget($args, $instance);
            $cached_widget = ob_get_clean();
            set_transient($transient_name, $cached_widget, $this->cache_time);
        }
        echo $cached_widget;
        echo '<!-- From widget cache in ' . number_format(microtime(true) - $timer_start, 5) . ' seconds -->';
        return false;
    }
    function in_widget_form($t, $return, $instance) {
        $instance = wp_parse_args((array)$instance, array('title' => '', 'text' => '', 'wc_cache' => null));
        if (!isset($instance['wc_cache'])) $instance['wc_cache'] = null;
?>
        <p>
            <input id="<?php
        echo $t->get_field_id('wc_cache'); ?>" name="<?php
        echo $t->get_field_name('wc_cache'); ?>" type="checkbox" <?php
        checked(isset($instance['wc_cache']) ? $instance['wc_cache'] : 0); ?> />
            <label for="<?php
        echo $t->get_field_id('wc_cache'); ?>">禁止缓存本工具?</label>
        </p>
        <?php
    }
    function widget_update_callback($instance, $new_instance, $old_instance) {
        $instance['wc_cache'] = isset($new_instance['wc_cache']);
        return $instance;
    }
} 
$GLOBALS['Auto_Widget_cache'] = new Auto_Widget_cache();