我总是在我的查询中移动我的过滤器，当我的查询没有返回结果时，这将阻止它们显示任何内容。您只需移动以下内容
echo $args[ \'before_widget\' ];
if ( !empty( $title ) )
echo $args[\'before_title\'] . $title . $args[\'after_title\'];
就在这条线之后
if ( $related_posts ) { ?>
编辑我很快重写了一个小部件，以适应我的相关帖子功能。我已经评论了一些存在问题的地方。希望这有帮助
<?php
/**
* Related_Posts_Widget widget class
*
* Displays posts from a selected category
*
* @since 1.0.0
*/
class Related_Posts_Widget extends WP_Widget
{
public function __construct()
{
parent::__construct(
\'widget_related_posts\',
_x( \'Related Posts Widget\', \'Related Posts Widget\' ),
[ \'description\' => __( \'Display a list of related posts.\' ) ]
);
$this->alt_option_name = \'widget_related_posts\';
add_action( \'save_post\', [$this, \'flush_widget_cache\'] );
add_action( \'deleted_post\', [$this, \'flush_widget_cache\'] );
add_action( \'switch_theme\', [$this, \'flush_widget_cache\'] );
}
public function widget( $args, $instance )
{
$cache = [];
if ( ! $this->is_preview() ) {
$cache = wp_cache_get( \'widget_rel_posts\', \'widget\' );
}
if ( ! is_array( $cache ) ) {
$cache = [];
}
if ( ! isset( $args[\'widget_id\'] ) ) {
$args[\'widget_id\'] = $this->id;
}
if ( isset( $cache[ $args[\'widget_id\'] ] ) ) {
echo $cache[ $args[\'widget_id\'] ];
return;
}
ob_start();
$title = ( ! empty( $instance[\'title\'] ) ) ? $instance[\'title\'] : __( \'Related Posts\' );
/** This filter is documented in wp-includes/default-widgets.php */
$title = apply_filters( \'widget_title\', $title, $instance, $this->id_base );
$number = ( ! empty( $instance[\'number\'] ) ) ? absint( $instance[\'number\'] ) : 5;
if ( ! $number ) {
$number = 5;
}
$cat_id = $instance[\'cat_id\'];
$thumbnail = $instance[\'thumbnail\'] ? true : false;
/**
* Filter the arguments for the Related Posts Widget.
*
* @since 1.0.0
*
*/
$cat_select = [
\'numberposts\' => $number,
\'cat\' => $cat,
];
if ( function_exists( \'get_related_posts\' ) ) { // This line was wrong, get_related_posts_widget should be get_related_posts
$related_posts = get_related_posts( \'authors\', $cat_select );
if ( $related_posts ) {
echo $args[\'before_widget\'];
if ( $title ) { // This should not be !$title
echo $args[\'before_title\'] . $title . $args[\'after_title\'];
}
?>
<ul class="related-cat">
<?php foreach ( $related_posts as $post ) {
setup_postdata( $post ); ?>
<li>
<?php if ( $thumbnail ) : ?>
<figure class="post-thumbnail">
<?php the_post_thumbnail( \'tie-large\' ); ?>
</figure>
<?php endif; ?>
<h3><a href="<?php echo get_the_permalink( $post->ID ); ?>"> <?php echo get_the_title( $post->ID );?> </a></h3>
</li>
<?php } //foreach ( $related_posts as $post ) ?>
</ul>
<?php
} // end if
wp_reset_postdata(); // You forgot this, this is very very very important
echo $args[\'after_widget\'];
}
if ( ! $this->is_preview() ) {
$cache[ $args[\'widget_id\'] ] = ob_get_flush();
wp_cache_set( \'widget_rel_posts\', $cache, \'widget\' );
} else {
ob_end_flush();
}
}
public function update( $new_instance, $old_instance )
{
$instance = $old_instance;
$instance[\'title\'] = strip_tags( $new_instance[\'title\'] );
$instance[\'number\'] = (int) $new_instance[\'number\'];
$instance[\'cat_id\'] = (int) $new_instance[\'cat_id\'];
$instance[\'thumbnail\'] = $new_instance[\'thumbnail\'];
$this->flush_widget_cache();
$alloptions = wp_cache_get( \'alloptions\', \'options\' );
if ( isset($alloptions[\'widget_related_posts\']) )
delete_option(\'widget_related_posts\');
return $instance;
}
public function flush_widget_cache()
{
wp_cache_delete(\'widget_rel_posts\', \'widget\');
}
public function form( $instance )
{
$title = isset( $instance[\'title\'] ) ? esc_attr( $instance[\'title\'] ) : \'\';
$number = isset( $instance[\'number\'] ) ? absint( $instance[\'number\'] ) : 5;
$cat_id = isset( $instance[\'cat_id\'] ) ? absint( $instance[\'cat_id\'] ) : 1;
$thumbnail = isset( $instance[\'thumbnail\'] ) ? $instance[\'thumbnail\'] : false;
?>
<p>
<label for="<?php echo $this->get_field_id( \'title\' ); ?>"><?php _e( \'Title:\' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( \'title\' ); ?>" name="<?php echo $this->get_field_name( \'title\' ); ?>" type="text" value="<?php echo $title; ?>" />
</p>
<p>
<label for="<?php echo $this->get_field_id( \'number\' ); ?>"><?php _e( \'Number of posts to show:\' ); ?></label>
<input id="<?php echo $this->get_field_id( \'number\' ); ?>" name="<?php echo $this->get_field_name( \'number\' ); ?>" type="text" value="<?php echo $number; ?>" size="3" />
</p>
<p>
<label for="<?php echo $this->get_field_id(\'cat_id\'); ?>"><?php _e( \'Category Name:\' )?></label>
<select id="<?php echo $this->get_field_id(\'cat_id\'); ?>" name="<?php echo $this->get_field_name(\'cat_id\'); ?>">
<?php
$this->categories = get_categories();
foreach ( $this->categories as $cat ) {
$selected = ( $cat->term_id == esc_attr( $cat_id ) ) ? \' selected = "selected" \' : \'\';
$option = \'<option \'.$selected .\'value="\' . $cat->term_id;
$option = $option .\'">\';
$option = $option .$cat->name;
$option = $option .\'</option>\';
echo $option;
}
?>
</select>
</p>
<p>
<label for="<?php echo $this->get_field_id(\'thumbnail\'); ?>"><?php _e( \'Hide post thumbnail\' ); ?></label>
<?php $checked = ( $thumbnail ) ? \' checked=\\"checked\\" \' : \'\'; ?>
<input type="checkbox" id="<?php echo $this->get_field_id( \'thumbnail\' ); ?>" name="<?php echo $this->get_field_name( \'thumbnail\' ); ?>" value="true" <?php echo $checked; ?> />
</p>
<?php
}
}
add_action( \'widgets_init\', function ()
{
register_widget( \'Related_Posts_Widget\' );
});
