不能按分类法查询用户。您需要重新考虑您的系统。我该怎么办？

保留分类法，但仅用于输出可选择的值-wp_dropdown_categories()AS 用户元，NOT AS 分类法-update_user_meta()WP_User_Query()

Example:

// This will check if form was submitted, it will not trigger/show on "normal" page load
if( $_SERVER[\'REQUEST_METHOD\'] == \'POST\' ) {

    // This will get the profession from input after form is submitted & page reloaded
    // Change "profession" to the name of that input where user can choose profession
    $submitted_profession = $_POST[\'profession\'];

    // Arguments for user query, see more from the user query link above
    $args = array(

        // How many to return?
        \'number\' => 3,   

        // User meta
        \'meta_query\' => array(
            array(
                \'key\'     => \'profession\',  // Name of user meta key in database
                \'value\'   => $submitted_profession, // We get this from form, see above
                \'compare\' => \'=\' 
            )
        )
    );

    // Query itself
    $suggested_users_query = new WP_User_Query( $args );

    // Get the results
    $users = $suggested_users_query->get_results();

    // Check if there actually are users based on that criteria 
    if ( ! empty( $users ) ) {

        // All the output how you want your users to look like goes here 

        // I wrote a small example

        echo \'<ul>\';

        // Loop trough each user 
        foreach ( $users as $user ) {

            // Get all the user data
            // To find all the fields you could use, search "get_userdata()" online
            $user_info = get_userdata( $user->ID );
            echo \'<li>\' . $user_info->first_name.\' \' . $user_info->last_name . \'</li>\';
        }

        echo \'</ul>\';

    } 
    // No users with that profession
    else {

        echo \'No users with profession \' . $submitted_profession;
    }
}