source: trunk/xpressme_integration_kit/wp-content/themes/xpress_default/blocks/widget_block_theme.php

<?php
// Block Version: 1.1
function widget_block($options)
{
        $mydirname = empty( $options[0] ) ? 'xpress' : $options[0] ;
        $this_template = empty( $options[1] ) ? 'db:'.$mydirname.'_block_widget.html' : trim( $options[1] );
        $title_show = empty( $options[2] ) ? false : true ;
        $widget_select = empty( $options[3] ) ? '' : $options[3] ;

        $selected = explode(',' , $widget_select);

        $output = '';
        foreach($selected as $select){
                $ex = explode('::',$select);
                $sidebar_id = $ex[0];
                $widget_id = $ex[1] ;
        
                ob_start();
                        render_widget($sidebar_id,$widget_id);
                        $output .= ob_get_contents();
                ob_end_clean(); 
        }
        if (count($selected) > 1){
                $output = "<ul>\n" . $output . "\n</ul>\n";
        } else {
                if(!$title_show){
                        $del_pattern = '<[^>]*class\s*=\s*[\'|"]widgettitle[\'|"]\s*>[^<]*<\/[^>]*>';
                        $output = preg_replace('/' . $del_pattern . '/', '', $output);
                }
                if (preg_match('/^<li[^>]*>.*<\/li>$/s',$output)){
                        $output = preg_replace('/^<li[^>]*>/', '', $output);
                        $output = preg_replace('/<\/li>$/', '', $output);
                }
        }
        $block['widget'] = $output;
        if (empty($output)) $block['err_message'] = 'Selected Widget is not active. ';
        return $block ; 
}

function render_widget($index = 1, $widget_id) {
        global $wp_registered_sidebars, $wp_registered_widgets;

        if ( is_int($index) ) {
                $index = "sidebar-$index";
        } else {
                $index = sanitize_title($index);
                foreach ( (array) $wp_registered_sidebars as $key => $value ) {
                        if ( sanitize_title($value['name']) == $index ) {
                                $index = $key;
                                break;
                        }
                }
        }
        if (!function_exists('wp_get_sidebars_widgets')) {
                echo 'Not support sidebar widget';
                return;
        }
        $sidebars_widgets = wp_get_sidebars_widgets();
        $registered_sidebars = $wp_registered_sidebars[$index];
        $key_exists = array_key_exists($index, $sidebars_widgets);
        $is_array = is_array($sidebars_widgets[$index]);
        

        
        if ( empty($registered_sidebars) || !$key_exists || !$is_array || empty($sidebars_widgets[$index]) )
                return false;

        $sidebar = $wp_registered_sidebars[$index];

        $did_one = false;
        foreach ( (array) $sidebars_widgets[$index] as $id ) {
                if ($id != $widget_id) continue;
                $params = array_merge(
                        array( array_merge( $sidebar, array('widget_id' => $id, 'widget_name' => $wp_registered_widgets[$id]['name']) ) ),
                        (array) $wp_registered_widgets[$id]['params']
                );

                // Substitute HTML id and class attributes into before_widget
                $classname_ = '';
                foreach ( (array) $wp_registered_widgets[$id]['classname'] as $cn ) {
                        if ( is_string($cn) )
                                $classname_ .= '_' . $cn;
                        elseif ( is_object($cn) )
                                $classname_ .= '_' . get_class($cn);
                }
                $classname_ = ltrim($classname_, '_');
                $params[0]['before_widget'] = sprintf($params[0]['before_widget'], $id, $classname_);

                $params = apply_filters( 'dynamic_sidebar_params', $params );

                $callback = $wp_registered_widgets[$id]['callback'];

                if ( is_callable($callback) ) {
                        call_user_func_array($callback, $params);
                        $did_one = true;
                }
        }

        return $did_one;
}
?>