WordPress将在保存到post meta时序列化数组。存储在键下的数据_employer_socials 在您的示例中看起来like this:

Array
(
    [0] => Array
        (
                [network] => facebook
                [url] => #
        )

    [1] => Array
        (
                [network] => twitter
                [url] => #
        )

    [2] => Array
        (
                [network] => linkedin
                [url] => #
        )

    [3] => Array
        (
                [network] => instagram
                [url] => #
        )
)

当您获得meta时，WP将为您取消序列化，如下所示：

$employer_socials = get_post_meta( get_the_ID(), \'_employer_socials\', true );

然后，您可以将数据作为常规数组处理。保存阵列时，WP将为您序列化它。以下是一些可以作为起点使用的基本函数：

/**
 * Updates an existing network, or adds a new one if it does not exist.
 *
 * @param int    $post_id The Post ID to be updated.
 * @param string $network The name of the network to check.
 *
 * @return bool True if an update was made, false otherwise.
 */
function wpse_update_employee_social( $post_id, $network, $url ) {

    $employer_socials = get_post_meta( $post_id, \'_employer_socials\', true );

    // Update.
    if ( wpse_has_employer_social( $post_id, $network ) ) {
        foreach ( $employer_socials as $key => $employer_social ) {
            if ( $employer_social[\'network\'] === $network ) {
                $employer_socials[ $key ][\'url\'] = $url;
                update_post_meta( $post_id, \'_employer_socials\', $employer_socials );
                return true;
            }
        }
    } else {
        // Add.
        $employer_socials[] = [
            \'network\' => $network,
            \'url\'     => $url,
        ];
        update_post_meta( $post_id, \'_employer_socials\', $employer_socials );
        return true;
    }

    // Nothing was updated.
    return false;
}

/**
 * Checks if a given network exists.
 *
 * @param int    $post_id The Post ID to be updated.
 * @param string $network The name of the network to check.
 *
 * @return bool True if the network exits, false otherwise.
 */
function wpse_has_employer_social( $post_id, $network ) {
    $employer_socials = get_post_meta( $post_id, \'_employer_socials\', true );
    foreach ( $employer_socials as $employer_social ) {
        if ( $employer_social[\'network\'] === $network ) {
            return true;
        }
    }

    return false;
}

添加新员工社交的示例：

wpse_update_employee_social( 5302, \'wpse\', \'https://wordpress.stackexchange.com/users/208214/user1669296\' );

更新员工社交网站的示例：

wpse_update_employee_social( 5302, \'facebook\', \'#1234\' );