我发现您的代码中有两个问题。第一个是用户能力级别，第二个是如何保存数据。

您可以通过在保存功能中设置更高的功能要求来修复第一个功能，这是一些只有管理员才具有的功能。关于edit_user能力，WordPress Capabilities: edit_user vs edit_users

第二个问题可以通过添加isset() 检查是否发送自定义字段值$_POST. 在当前表单中，如果未设置自定义字段值，则$_POST[\'field-key] 结果在null 值，该值覆盖以前保存的任何数据。一、 e。update_user_meta( $user_id, \'pin\', $_POST[\'pin\'] );

下面是一个如何改进代码的示例。在我的示例中，我添加了一个nonce检查，升级了功能需求，添加了isset() 检查和数据清理。

function extra_user_profile_fields( $user ) {
  // add nonce field
  wp_nonce_field( \'my_extra_user_profile_fields\', \'my_extra_user_profile_fields_nonce\', true, true );
  ?>
  <!-- your html as it was -->
  <?php
}

function save_extra_user_profile_fields( $user_id ) {
  // Nonce checks to know the $_POST is coming from the right source
  if ( empty( $_POST[\'my_extra_user_profile_fields_nonce\'] ) || ! wp_verify_nonce( \'my_extra_user_profile_fields_nonce\', \'my_extra_user_profile_fields\' ) ) {
    return;
  }
  // Capabilities check
  // create_users is administrator only capability
  if ( ! current_user_can( \'create_users\', $user_id ) ) {
    return;
  }
  // valid field keys with related data type
  // update types as needed
  $fields = array(
    \'pin\'                        => \'string\',
    \'street-address\'             => \'string\',
    \'suburb\'                     => \'string\',
    \'postcode\'                   => \'string\',
    \'phone\'                      => \'string\',
    \'mobile\'                     => \'string\',
    \'president-year\'             => \'int\',
    \'secretary-year\'             => \'int\',
    \'competition-secretary-year\' => \'int\',
    \'treasurer-year\'             => \'int\',
    \'committee-member-year\'      => \'int\',
    \'joining-date\'               => \'string\',
    \'fees-paid\'                  => \'bool\',
    \'life-member\'                => \'string\',
    \'comments\'                   => \'string\',
    \'other-roles\'                => \'string\',
    \'year-left\'                  => \'int\',
  );
  // loop fields instead of typing each update separately
  foreach ($fields as $key => $data_type) {
    // check if field data is sent with $_POST
    if ( isset( $_POST[$key] ) ) {
      // update user meta with sanitized value
      update_user_meta( $user_id, $key, my_sanitize_user_data($_POST[$key], $data_type) );
    }
  } 
}

function my_sanitize_user_data( $value, string $type = \'\' ) {
  switch ($type) {
    case \'bool\':
      return in_array( $value, array(true, \'true\', 1, \'yes\') ); // returns true, if value is in array otherwise false
    case \'int\':
      return is_numeric($value) ? absint( $value ) : 0;
    default:
      return sanitize_text_field( $value );
  }
}