Question

我正在尝试制作一个简单的wordpress小部件，以显示我网站上提供的优惠和奖金数量。不幸的是，它似乎正在崩溃，就像缺少某些东西一样。

这是我的代码：

        // Block direct requests
    if ( !defined('ABSPATH') )
    die('-1');


add_action( 'widgets_init', function(){
     register_widget( 'MatchedBettingBonusCount' );
}); 

/**
 * Adds MatchedBettingBonusCount widget.
 */
class MatchedBettingBonusCount extends WP_Widget {

    /**
     * Register widget with WordPress.
     */
    function __construct() {
        parent::__construct(
            'MatchedBettingBonusCount', // Base ID
            __('MatchedBettingBonusCount', 'text_domain'), // Name
            array( 'description' => __( 'My first widget!', 'text_domain' ), ) // Args
        );
    }

    /**
     * Front-end display of widget.
     *
     * @see WP_Widget::widget()
     *
     * @param array $args     Widget arguments.
     * @param array $instance Saved values from database.
     */
    public function widget( $args, $instance ) {

        $sqlOfferCount = "SELECT * FROM vhyky_posts WHERE post_type =  'cs_cause' AND post_status =  'publish'";
        $sqlOfferSum = "SELECT sum(vpm.meta_value) FROM vhyky_posts vp, vhyky_postmeta vpm WHERE post_type = 'cs_cause' AND post_status =  'publish' AND vp.id = vpm.post_id";

        global $wpdb;
        $offerCount = $wpdb->get_results($sqlOfferCount);
        $offerSum = $wpdb->get_results($sqlOfferCount);


        echo $args['before_widget'];
        if ( ! empty( $instance['title'] ) ) {
            echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ). $args['after_title'];
        }
        echo __('We currently have <strong>'.$offerCount. '</strong> sign-up offers. Totalling an amazing <strong>&pound;'. $offerSum .'</strong> of bonuses' , 'text_domain' );
        echo $args['after_widget'];
    }

    /**
     * Back-end widget form.
     *
     * @see WP_Widget::form()
     *
     * @param array $instance Previously saved values from database.
     */
    public function form( $instance ) {
        if ( isset( $instance[ 'title' ] ) ) {
            $title = $instance[ 'title' ];
        }
        else {
            $title = __( 'New title', 'text_domain' );
        }
        ?>
        <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 esc_attr( $title ); ?>">
        </p>
        <?php 
    }

    /**
     * Sanitize widget form values as they are saved.
     *
     * @see WP_Widget::update()
     *
     * @param array $new_instance Values just sent to be saved.
     * @param array $old_instance Previously saved values from database.
     *
     * @return array Updated safe values to be saved.
     */
    public function update( $new_instance, $old_instance ) {
        $instance = array();
        $instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';

        return $instance;
    }

} // class My_Widget

我一直在尝试的很多东西似乎已经过时了。目前，该值仅为数组

Answer 1

首先，您需要添加聚合函数来计算您的商品（在第一个查询中更改）其次，您需要将get_results更改为get_var，因为您只返回了1个变量，默认返回get_results和对象数组。

这是更改后的代码：

    $sqlOfferCount = "SELECT count(*) FROM vhyky_posts WHERE post_type =  'cs_cause' AND post_status =  'publish'";
    $sqlOfferSum = "SELECT sum(vpm.meta_value) FROM vhyky_posts vp, vhyky_postmeta vpm WHERE post_type = 'cs_cause' AND post_status =  'publish' AND vp.id = vpm.post_id";

    global $wpdb;
    $offerCount = $wpdb->get_var($sqlOfferCount);
    $offerSum = $wpdb->get_var($sqlOfferCount);

创建Wordpress小部件 - $ wpdb无法正常工作

1 个答案: