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drupal 自定义block

//1.生成一个自定义的block
function keats_main_block_info(){
    $blocks['keats_main_mainmenu'] = array(
        'info' => t('Keats Mainmenu'),
    );
    return $blocks;
}

//2.渲染这个form
function keats_main_block_view($delta=''){
    switch($delta) {
        case 'keats_main_mainmenu' :
            $tree = menu_tree('main-menu');
            $block['content'] = theme('keats_mainmenu', array('menutree'=>$tree));
            return $block;
            break; 
            default:
           break;
    }
}

//3.在drupal 的 blocks 管理页面把这个block挂载到相应的region上(别忘了先刷新drupal缓存)