我已经搜索并看到了几个与此类似的问题和答案，但它们都不适合我。请帮我回答正确的问题！谢谢你！

<?php
if (isset($_POST[\'info_submit\'])){
        $user->data->user_nicename = $_POST[\'user_first_name\'].\'-\'.$_POST[\'user_last_name\'];
        $user->data->display_name = $_POST[\'user_first_name\'].\'-\'.$_POST[\'user_last_name\'];
        $user->data->user_email = esc_attr( $_POST[\'user_email\'] );
        wp_update_user($user);

        update_user_meta($user_id , \'user_firstname\' , $_POST[\'user_first_name\']);
        update_user_meta($user_id , \'user_lastname\' , $_POST[\'user_last_name\']);

    }
?>
<form class="" name="info_form" id="info_form" action="" enctype="text/plain" method="post">
    <div class="form-group">
        <div class="form-input">
            <label for="user_email">Email</label>
            <input required type="email" name="user_email" id="user_email" value="<?php echo get_userdata($user_id)->user_email;?>" required/>
        </div>
        <div class="form-input">
            <label for="user_first_name">First Name</label>
            <input required type="text" name="user_first_name" id="user_first_name" value="<?php echo get_userdata($user_id)->user_firstname;?>" required/>
        </div>
        <div class="form-input">
            <label for="user_last_name">Last Name</label>
            <input required type="text" name="user_last_name" id="user_last_name" value="<?php echo get_userdata($user_id)->user_lastname;?>" required/>
        </div>
        <div class="form-input">
            <label for="user_display_name">Display Name</label>
            <input required type="text" name="user_display_name" id="user_display_name" value="<?php echo get_userdata($user_id)->display_name;?>" required/>
        </div>
        <div class="form-input">
            <input type="submit" value="Save" name="info_submit" id="info_submit" />
        </div>
    </div>
</form>