随机帖子小工具类别选择分类

PetitQ WordPress教程 2023-2-01 951 0 0

```
/**
```
```
 * 随机小工具 分类
```
```
 *
```

 * Displays posts from a selected category

```
 *
```
```
 * @since 1.0.0
```

*/class Category_Posts extends WP_Widget

```
{
```
```
 
```
```
    public function __construct() 
```
```
    {
```
```
        parent::__construct(
```
```
            'widget_category_posts', 
```

            _x( 'Category Posts Widget', 'Category Posts Widget' ),

            [ 'description' => __( 'Display a list of posts from a selected category.' ) ]

```
        );
```

        $this->alt_option_name = 'widget_category_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_cat_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'] : __( 'Category 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'];

        $random         = $instance['rand'] ? true : false;

        $excerpt        = $instance['excerpt'] ? true : false;

        $thumbnail      = $instance['thumbnail'] ? true : false;

```
 
```
```
        /**
```

         * Filter the arguments for the Category Posts widget.

```
         *
```
```
         * @since 1.0.0
```
```
         *
```
```
         * @see WP_Query::get_posts()
```
```
         *
```

         * @param array $args An array of arguments used to retrieve the category posts.

         */        if( true === $random ) {

```
 
```
```
            $query_args = [
```

                'posts_per_page'    => $number,

                'cat'               => $cat_id,

                'orderby'           => 'rand'

```
            ];
```
```
 
```
```
        }else{  
```
```
 
```
```
            $query_args = [
```

                'posts_per_page'    => $number,

                'cat'               => $cat_id,

```
            ];
```
```
 
```
```
        }
```

        $q = new WP_Query( apply_filters( 'category_posts_args', $query_args ) );

```
 
```
```
        if( $q->have_posts() ) {
```
```
 
```

            echo $args['before_widget'];

```
            if ( $title ) {
```

                echo $args['before_title'] . $title . $args['after_title'];

```
            }               
```
```
 
```
```
            while( $q->have_posts() ) {
```
```
                $q->the_post(); ?>
```
```
 
```

                <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>

```
 
```

                    <header class="entry-header">

                        <?php the_title( '<p class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></p>' ); ?>

                    </header><!-- .entry-header -->

```
 
```
```
 <?php 
```

                    if ( has_post_thumbnail() && true === $thumbnail ) { ?>

```
 
```

                        <div class="post-thumbnail">

```
 
```

                            <?php the_post_thumbnail(); ?>

```
 
```

                        </div><!--/.post-thumbnail-->

```
 
```
```
 <?php 
```
```
                    }
```
```
 
```

                    if( true === $excerpt ) { ?>

```
 
```

                        <div class="entry-summary">

                            <?php the_excerpt(); ?>

                        </div><!-- .entry-summary -->

```
 
```
```
 <?php } ?>
```
```
 
```

                </article><!-- #post-## -->

```
 
```
```
 <?php
```
```
            }
```
```
 
```
```
 
```
```
            wp_reset_postdata();
```
```
        }
```

            echo $args['after_widget'];

```
 
```
```
        if ( ! $this->is_preview() ) {
```

            $cache[ $args['widget_id'] ] = ob_get_flush();

            wp_cache_set( 'widget_cat_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['rand']           = $new_instance['rand'];

        $instance['excerpt']        = $new_instance['excerpt'];

        $instance['thumbnail']      = $new_instance['thumbnail'];

```
        $this->flush_widget_cache();
```
```
 
```

        $alloptions = wp_cache_get( 'alloptions', 'options' );

        if ( isset($alloptions['widget_category_posts']) )

            delete_option('widget_category_posts');

```
 
```
```
        return $instance;
```
```
    }
```
```
 
```

    public function flush_widget_cache()

```
    {
```

        wp_cache_delete('widget_cat_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;

        $random     = isset( $instance['rand'] ) ? $instance['rand'] : false;

        $excerpt    = isset( $instance['excerpt'] ) ? $instance['excerpt'] : false;

        $thumbnail  = isset( $instance['thumbnail'] ) ? $instance['thumbnail'] : false;

```
        ?>
```
```
 
```
```
 
```

            <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; ?>" />

```
 
```
```
 
```
```
 
```

            <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" />

```
 
```
```
 
```
```
 
```

            <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>
```
```
 
```
```
 
```
```
 
```

            <label for="<?php echo $this->get_field_id('rand'); ?>"><?php _e( 'Show random posts' ); ?></label>

            <?php $checked = ( $random ) ? ' checked=\"checked\" ' : ''; ?>

            <input type="checkbox" id="<?php echo $this->get_field_id( 'rand' ); ?>" name="<?php echo $this->get_field_name( 'rand' ); ?>" value="true" <?php echo $checked; ?> />

```
 
```
```
 
```
```
 
```

            <label for="<?php echo $this->get_field_id('excerpt'); ?>"><?php _e( 'Show excerpt. If unchecked, only the title of the post will be displayed' ); ?></label>

            <?php $checked = ( $excerpt ) ? ' checked=\"checked\" ' : ''; ?>

            <input type="checkbox" id="<?php echo $this->get_field_id( 'excerpt' ); ?>" name="<?php echo $this->get_field_name( 'excerpt' ); ?>" value="true" <?php echo $checked; ?> />

```
 
```
```
 
```
```
 
```

            <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; ?> />

```
 
```
```
 
```
```
 <?php
```
```
    }
```
```
 
```
```
}
```
```
 
```

add_action( 'widgets_init', function ()

```
{
```

    register_widget( 'Category_Posts' );

```
});
```

随机帖子小工具类别选择分类

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