如何从WordPress的meta框中获取信息并将其显示在页面模板中

Question

我在回显模板页面上的meta-box的元数据时遇到问题。数据似乎已保存，在页面上回显数据时我在哪里做错了？

T我在检查是否设置了变量的时候放入的'hello'会在页面上显示出来，而不是变量本身。我已经尝试过在函数.php中保存信息的其他地方，但是我所知道的地方似乎是将信息保存到其中的唯一地方。那里或我试图在页面上回显它们时有问题吗？

这是从我的模板角度来看的HTML代码。 （page-facility.php）

<aside class="facility-content-sidebar">
  <?php
      if ( isset( $mf ) && '' !== $mf ) {
        echo 'hello';
        echo esc_attr( $mf );
     }
     if ( isset( $ls ) && '' !== $ls ) {
        echo 'hello';
        echo esc_attr( $ls );
     }
  ?>
</aside>

这是我在functions.php中的全部代码

/* Opening Hours meta box on template */
add_action('add_meta_boxes', 'add_openinghours_meta');
function add_openinghours_meta() {
    global $post;

    if(!empty($post))
    {
        $pageTemplate = get_post_meta($post->ID, '_wp_page_template', true);

        if($pageTemplate == 'page-facility.php' )
        {
            add_meta_box(
                'openinghours_meta', // $id
                'Öppettider', // $title
                'display_opening_information', // $callback
                'page', // $page
                'normal', // $context
                'high'); // $priority
        }
    }
}

if ( ! function_exists( 'display_opening_information' ) ) {

    /**
     * Meta box render function
     *
     * @param  object $post Post object.
     * @since  1.0.0
     */

    function display_opening_information($post) {
        // Add the HTML for the post meta
        $meta = get_post_meta( $post->ID );
        $openinghours_mf_input_field = ( isset( $meta['openinghours_mf_input_field'][0] ) && '' !== $meta['openinghours_mf_input_field'][0] ) ? $meta['openinghours_mf_input_field'][0] : '';
        $openinghours_ls_input_field = ( isset( $meta['openinghours_ls_input_field'][0] ) && '' !== $meta['openinghours_ls_input_field'][0] ) ? $meta['openinghours_ls_input_field'][0] : '';
        wp_nonce_field( 'openinghours_control_meta_box', 'openinghours_control_meta_box_nonce' ); // Always add nonce to your meta boxes!
        ?>
        <div class="post_meta_extras">
            <p>
                <label><?php esc_attr_e( 'Måndag-Fredag:', 'openinghours_mf_input_field' ); ?></label>
                <input type="text" name="openinghours_mf_input_field" value="<?php echo esc_attr( $openinghours_mf_input_field ); ?>">
            </p>
            <p>
                <label><?php esc_attr_e( 'Lördag-Söndag:', 'openinghours_ls_input_field' ); ?></label>
                <input type="text" name="openinghours_ls_input_field" value="<?php echo esc_attr( $openinghours_ls_input_field ); ?>">
            </p>
        </div>
        <?php
    }
}

add_action( 'save_post', 'openinghours_save_metabox' );

if ( ! function_exists( 'openinghours_save_metabox' ) ) {
    /**
     * Save controls from the meta boxes
     *
     * @param  int $post_id Current post id.
     * @since 1.0.0
     */
    function openinghours_save_metabox( $post_id ) {
        /*
         * We need to verify this came from the our screen and with proper authorization,
         * because save_post can be triggered at other times. Add as many nonces, as you
         * have metaboxes.
         */
        if ( ! isset( $_POST['openinghours_control_meta_box_nonce'] ) || ! wp_verify_nonce( sanitize_key( $_POST['openinghours_control_meta_box_nonce'] ), 'openinghours_control_meta_box' ) ) { // Input var okay.
            return $post_id;
        }

        // Check the user's permissions.
        if ( isset( $_POST['post_type'] ) && 'page' === $_POST['post_type'] ) { // Input var okay.
            if ( ! current_user_can( 'edit_page', $post_id ) ) {
                return $post_id;
            }
        } else {
            if ( ! current_user_can( 'edit_post', $post_id ) ) {
                return $post_id;
            }
        }

        /*
         * If this is an autosave, our form has not been submitted,
         * so we don't want to do anything.
         */
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
            return $post_id;
        }

        /* Ok to save */

        if ( isset( $_POST['openinghours_mf_input_field'] ) ) { // Input var okay.
            update_post_meta( $post_id, 'openinghours_mf_input_field', sanitize_text_field( wp_unslash( $_POST['openinghours_mf_input_field'] ) ) ); // Input var okay.
        }
        if ( isset( $_POST['openinghours_ls_input_field'] ) ) { // Input var okay.
            update_post_meta( $post_id, 'openinghours_ls_input_field', sanitize_text_field( wp_unslash( $_POST['openinghours_ls_input_field'] ) ) ); // Input var okay.
        }

    }

    $mf = get_post_meta( get_the_ID(), 'openinghours_mf_input_field', true );
    $ls = get_post_meta( get_the_ID(), 'openinghours_ls_input_field', true );
}

我希望使用在meta-box中的信息来打印virables。显示该设施的开放时间。

Answer 1

请确保在$mf模板文件中初始化$ls和page-facility.php变量。

例如：

<aside class="facility-content-sidebar">
  <?php
     //initilize variables
     $mf = get_post_meta( get_the_ID(), 'openinghours_mf_input_field', true );
     $ls = get_post_meta( get_the_ID(), 'openinghours_ls_input_field', true );

     //then check if empty
     if ( isset( $mf ) && '' !== $mf ) {
        echo 'hello';
        echo esc_attr( $mf );
     }
     if ( isset( $ls ) && '' !== $ls ) {
        echo 'hello';
        echo esc_attr( $ls );
     }
  ?>
</aside>