尝试一下，您需要使用两个过滤器“getarchives\\u where”和“getarchives\\u join”来改变归档文件的显示方式并包括类别17。。
function widget( $args, $instance ) {
extract($args);
//$c = $instance[\'count\'] ? \'1\' : \'0\';
//$d = $instance[\'dropdown\'] ? \'1\' : \'0\';
$format = empty($instance[\'format\']) ? \'html\' : apply_filters(\'widget_type\', $instance[\'format\']);
$type = empty($instance[\'type\']) ? \'yearly\' : apply_filters(\'widget_type\', $instance[\'type\']);
$before = empty($instance[\'before\']) ? \'\' : apply_filters(\'widget_type\', $instance[\'before\']);
$after = empty($instance[\'after\']) ? \'\' : apply_filters(\'widget_type\', $instance[\'after\']);
$limit = apply_filters(\'widget_limit\', $instance[\'limit\']);
$title = apply_filters(\'widget_title\', empty($instance[\'title\']) ? __(\'Annual Archive\', \'anarch\') : $instance[\'title\'], $instance, $this->id_base);
//$wpdb->query(\'select * from my_plugin_table where foo = "bar"\');
echo $before_widget;
if ( $title )
echo $before_title . $title . $after_title;
if ($format == \'option\') {
$dtitle = __(\'Select Year\', \'anarch\');
if ($type == \'monthly\'){
$dtitle = __(\'Select Month\', \'anarch\');
}
else if($type == \'weekly\'){
$dtitle = __(\'Select Week\', \'anarch\');
}
else if($type == \'daily\'){
$dtitle = __(\'Select Day\', \'anarch\');
}
else if($type == \'postbypost\' || $type == \'alpha\'){
$dtitle = __(\'Select Post\', \'anarch\');
}
add_filter( \'getarchives_where\', \'customarchives_where\' );
add_filter( \'getarchives_join\', \'customarchives_join\' );
function customarchives_join( $x ) {
global $wpdb;
return $x . " INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb->term_relationships.object_id) INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)";
}
function customarchives_where( $x ) {
global $wpdb;
$include = \'17\'; // category id to include
return $x . " AND $wpdb->term_taxonomy.taxonomy = \'category\' AND $wpdb->term_taxonomy.term_id IN ($include)";
}
?>
<select name="archive-dropdown" onchange=\'document.location.href=this.options[this.selectedIndex].value;\'> <option value=""><?php echo esc_attr(__($dtitle, \'anarch\')); ?></option> <?php wp_get_archives(apply_filters(\'widget_archive_dropdown_args\', array(\'type\' => $type, \'format\' => \'option\', \'show_post_count\' => $c, \'before\' => $before, \'after\' => $after, \'limit\' => $limit))); ?> </select>
<?php
} else {
?>
<ul>
<?php wp_get_archives(apply_filters(\'widget_archive_args\', array(\'type\' => $type, \'limit\' => $limit, \'format\' => $format, \'before\' => $before, \'after\' => $after, \'show_post_count\' => $c))); ?>
</ul>
<?php
}
echo $after_widget;
remove_filter( \'getarchives_where\', \'customarchives_where\' );
remove_filter( \'getarchives_join\', \'customarchives_join\' );
}
