我试图添加额外的用户配置文件字段。之后，我想使用短代码显示这些额外字段。我在函数中添加了以下代码。添加额外字段并将其保存到数据库的php文件：

<!-- add extra fields to user profile -->
<?php
add_action( \'show_user_profile\', \'extra_user_profile_fields\' );
add_action( \'edit_user_profile\', \'extra_user_profile_fields\' );

function extra_user_profile_fields( $user ) { ?>
    <h3><?php _e("Extra profile information", "blank"); ?></h3>

    <table class="form-table">
    <tr>
        <th><label for="school-id"><?php _e("KlickSchool ID"); ?></label></th>
        <td>
           <input type="text" name="school-id" id="school-id" value="<?php echo      esc_attr( get_the_author_meta( \'school-id\', $user->ID ) ); ?>"     class="regular-text" /><br />
           <span class="description"><?php _e("Bitte geben Sie die ID für die     Niederlassung an"); ?></span>
        </td>
    </tr>
    <tr>
       <th><label for="city"><?php _e("Standort"); ?></label></th>
       <td>
         <input type="text" name="city" id="city" value="<?php echo esc_attr( get_the_author_meta( \'city\', $user->ID ) ); ?>" class="regular-text" /><br />
         <span class="description"><?php _e("Bitte geben Sie den Standort der Niederlassung ein"); ?></span>
       </td>
    </tr>
   </table>
<?php }

add_action( \'personal_options_update\', \'save_extra_user_profile_fields\' );
add_action( \'edit_user_profile_update\', \'save_extra_user_profile_fields\' );

function save_extra_user_profile_fields( $user_id ) {

     if ( !current_user_can( \'edit_user\', $user_id ) ) { return false; }

     update_user_meta( $user_id, \'school-id\', $_POST[\'school-id\'] );
     update_user_meta( $user_id, \'city\', $_POST[\'city\'] );
}
?>

我试图用以下代码显示一个额外字段：

<?php
( \'adress-klickschool\', \'klickschool_adress\' );

function klickschool_adress() {
?>

      <div class="flex_column av_one_half  flex_column_div av-zero-column-padding avia-builder-el-2  el_after_av_one_half  el_before_av_codeblock adress-column">
    <?php
     $current_user = wp_get_current_user();

    /*
    * @example Safe usage: $current_user = wp_get_current_user();
    * if ( ! ( $current_user instanceof WP_User ) ) {
    *     return;
    * }
    */
    echo\'<div class="image-info-box">\',\'<img src="http://intranet.klickschool.de/wp-content/uploads/2019/11/logo-sh.svg">\', \'</div>\';?>
**<?php if ( get_the_author_meta( \'school-id\' ) ) { ?>
    <p class="school-id">
        <p><?php the_author_meta( \'school-id\' ); ?></p>
    </p>
<?php } ?>**
<?php
echo \'<div class="info-box">\' . $current_user->description . \'<br />\', \'</div>\';
?>
</div>      
<?php } ?>

标有两颗星的代码应显示额外添加的字段“学校id”。但代码不显示此字段。你有什么想法吗？

$school_id = get_user_meta( $current_user->ID, \'school-id\',true);
if ( !empty($school_id) ) { ?>
    <p class="school-id">
        <p>
           <?php echo $school_id; # what you want to do with school id ?>
        </p>
    </p>
<?php }