如何让注册用户通过前台改变自己的用户角色？

有时我想让我的注册用户有机会自己免费升级他们的用户角色。我通过编写一个小插件尝试了这一点，但sady我无法在使用短代码时显示html表单，因此无法测试它是否有效。我真的很感谢你的帮助。

function upgrade_to_premium() {
    if( is_user_logged_in() ) {
        if( is_page( \'upgrade-to-premium\' ) ) {
            $current_user = wp_get_current_user();
            if( $current_user->roles[0] == "subscriber" || $current_user->roles[0] == "premium" ) {
                $user_id = $current_user->id;
                $role = $current_user->roles[0];
                if( $_POST[\'role\']){
                    if( $_POST[\'role\'] == $role ) {
                        echo "Sorry, you are already a " . $role . "!";
                    } else {
                        $role = $_POST[\'role\'];
                        $userdata = array();
                        $userdata[\'ID\'] = $user_id;
                        $userdata[\'role\'] = $role;
                        wp_update_user($userdata);
                        echo "Your user type has been changed!  You are now a " . $role . "!";
                    }
                }
                ?>

                    <form method="post" action="">
                        Please select a role:<br/>
                        <select name="role">
                            <option value="subscriber" selected="selected">Subscriber</option>
                            <option value="premium">Premium</option>
                        </select>
                        <INPUT TYPE="submit" name="submit" />
                    </form>

                <?php
            }
        }
    }
}
add_shortcode( \'upgrade_to_premium\', \'upgrade_to_premium\' );

add_shortcode( \'upgrade_to_premium\', \'upgrade_to_premium\' ); function upgrade_to_premium() { // Stop if user is not logged in. if ( ! is_user_logged_in() ) return; ob_start(); ?> <form method="post" action=""> Please select a role:<br/> <select name="role"> <option value="subscriber" selected="selected">Subscriber</option> <option value="premium">Premium</option> </select> <input type="submit" name="submit" /> </form> <?php // Do not process anything if it\'s not $_POST if ( ! isset( $_POST[\'role\'] ) ) return; // Never trust user input. $role = sanitize_key( $_POST[\'role\'] ); if ( ! in_array( $role, array( \'subscriber\', \'premium\' ) ) ) return; // Get the user object $user = new WP_User( get_current_user_id() ); $index = key( $user->roles ); $user_role = $user->roles[ $index ]; // User already got that user if ( $user_role == $role ) { echo sprintf( __( \'You already have %s role.\' ), $role ); } else { // update user role $user->set_role( $role ); echo sprintf( __( \'Your role was changed to %s.\' ), $role ); } $output = ob_get_contents(); ob_end_clean(); return $output; }

Front-end Ajax File Upload

我正在从事一个项目，注册用户可以将文件上传到特定的帖子类型。为了实现更流畅的导航，我使用Ajax制作了整个部分，因此页面永远不会重新加载<然而，我很难<input type=\"file\"> 工作以下是我目前的代码：标记<?php // Start Loop and current meta of the post ?> <form class=\"update_post\" method=\"post\" accept-charset

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