在将CVS文件中的数据解析为自定义post类型时，我想将数据解析为我创建的元框的字段。

元框字段通常更新如下：

  function fredningszone_meta_box() {

    add_meta_box( 
        \'punkt_fredningszone\', // $id - Meta box ID (used in the \'id\' attribute for the meta box).
        \'Data for fredningszone\', // $title - Title of the meta box.
        \'punkt_fredningszone_callback\', // $callback - Function that fills the box with the desired content. The function should echo its output. 
        \'punkt\', // $screen - he screen or screens on which to show the box (such as a post type, \'link\', or \'comment\'). 
        \'normal\', // $context - The context within the screen where the boxes should display.
        \'high\' // $priority - The priority within the context where the boxes should show (\'high\', \'low\').
    );
}

add_action( \'add_meta_boxes\', \'fredningszone_meta_box\' );

/**
 * Enable and display custom fields.
**/

function punkt_fredningszone_callback() { 

    global $post;  

    $meta = get_post_meta( $post->ID, \'fredningszone_data\', true ); ?>

    <input type="hidden" name="fredningszone_data_nonce" value="<?php echo wp_create_nonce( basename(__FILE__) ); ?>">

    <!-- All fields goes below this line -->

    <p>
        <label for="fredningszone_data[id]">ID</label>
        <br>
        <input type="text" name="fredningszone_data[id]" id="fredningszone_data[id]" class="regular-text widefat" placeholder="Indtast fredningszonens ID (f.eks 450)" value="<?php echo $meta[\'id\']; ?>">
    </p>

。。但是，当我通过我构建的另一个功能解析来自CSV的数据时，我无法访问元框的字段。请参见下面的代码：

下面的代码是我试图构建的导入插件的一段代码，其中CSV数据不会解析为meta box的字段。见下文：

$check_post_exists = function( $title ) use ( $wpdb, $postTypeArray ) {

        // Get an array of all posts within our custom post type
        $posts = $wpdb->get_col( "SELECT post_title FROM {$wpdb->posts} WHERE post_type = \'{$postTypeArray["custom-post-type"]}\' AND post_status = \'publish\'" );

        // Check if the passed title exists in array
        return in_array( $title, $posts );
    };

    $i = 0;

    foreach ( $posts() as $post ) {

        // If the post exists, skip this post and go to the next one
        if ( $check_post_exists( $post["zoneid"] ) ) {
            continue;
        }

        $i++;

        // Insert the post into the database
        $post["id"] = wp_insert_post( array(
            "post_title" => $post["zoneid"],
            "post_content" => $post["bemaerkning"],
            "post_type" => $postTypeArray["custom-post-type"],
            "post_punktcat" => array( 4 ),
            "post_status" => "publish"
        ));

        // Set post category to 4
        wp_set_post_terms($post["id"], 4, \'punktcat\', false ); 

        $meta = get_post_meta($post["id"], \'fredningszone_data\', true );

        var_dump($meta);

        // THIS IS THE FIELD I WANT TO UPDATE, BUT I HAVE NOT YET SUCCESFULLY POPULATED THE FIELD YET
        update_post_meta($post["id"], $meta["id"], $post["zoneid"]);

        // Update Custom Meta
        update_post_meta($post["id"], \'_location\', $post["zoneid"]);
    }

    echo \'<div id="message" class="updated fade"><p>\' . $i . \' posts have succesfully been imported from CSV!\' . \'</p></div>\';

如何将数据解析到自定义元框的字段中？

$check_post_exists = function( $title ) use ( $wpdb, $postTypeArray ) {

        // Get an array of all posts within our custom post type
        $posts = $wpdb->get_col( "SELECT post_title FROM {$wpdb->posts} WHERE post_type = \'{$postTypeArray["custom-post-type"]}\' AND post_status = \'publish\'" );

        // Check if the passed title exists in array
        return in_array( $title, $posts );
    };

    $i = 0;
    $e = 0;

    foreach ( $posts() as $post ) {

        // If the post exists, skip this post and go to the next one
        if ( $check_post_exists( $post["properties/ID"] ) ) {
            $e++;
            continue;
        }

        $i++;

        // Insert the post into the database
        $post["id"] = wp_insert_post( array(
            "post_title" => $post["properties/ID"],
            "post_type" => $postTypeArray["custom-post-type"],
            "post_punktcat" => array( 4 ),
            "post_status" => "publish"
        ));

        // Set post category to 4
        wp_set_post_terms($post["id"], 4, \'punktcat\', false ); 

        $meta = get_post_meta( $post["id"], \'fredningszone_data\', true );

        $fredningszone_data = array(
            "id" => $post["properties/ID"],
            "navn" => $post["properties/NAVN"], 
            "kontaktsted" => $post["properties/Kontaktsted"],
            "fredningsperiode" => $post["properties/FREDNINGSP"],
            "periode_type" => $post["properties/PeriodeType"], 
            "lovgivningsgrundlag" => $post["properties/LOVGRUNDLA"],
            "bemaerkning" => $post["properties/BEMARKNING"],
            "www" => $post["properties/WWW"],
            "www2" => $post["properties/WWW2"],
            "geometry" => $post["geometry/type"]
        );

        // Update meta box values
        update_post_meta($post["id"], \'fredningszone_data\', $fredningszone_data);
        //update_post_meta($post["id"], \'fredningszone_data\', $post["zoneid"]);
        update_post_meta($post["id"], \'_location\', $post["zoneid"]);
    }