表单显示插件中出现致命错误

我创建了这个插件，现在我收到了致命的错误消息。我对这个很陌生。请告诉我哪里错了：

<?php
/*
Plugin Name: Xenon-Result
Plugin URI:  https://developer.wordpress.org/plugins/the-basics/
Description: Basic result display plugin.
Version:     1.0
Author:      Himanshu Gupta
Author URI:  https://developer.wordpress.org/
License:     GPL2
License URI: https://www.gnu.org/licenses/gpl-2.0.html
*/

function installer(){
    include(\'installer.php\');
}
register_activation_hook( __file__, \'installer\' ); //executes installer php when installing plugin to create new database

add_action(\'admin_menu\',\'result_menu\'); //wordpress admin menu creation
function result_menu()
{
    add_menu_page(\'Result\',\'Result\',\'administrator\',\'xenon-result\');
    add_submenu_page( \'xenon-result\', \'Manage Marks\', \' Manage Marks\', \'administrator\', \'Manage-Xenon-Marks\', \'Xenon_Marks\' );
}
function Xenon_Marks()
{
    include(\'new/result-add-marks.php\');
}
/*function Result_Form()
{
    include(\'new/result-form.php\');
}*/

function html_form_code() 
{
echo \'<form action="" method="post">\';
echo \'<fieldset>\';
echo \'<legend>Student Information</legend>\';
echo \'Roll Number: <input type="number" min="170001" max="171000" name="rollNumber"><br>\';
echo \'<input type="submit">\';
echo \'<input type ="reset">\';
echo \'</form>\';
}

function result_display(){
$wpdb;
$student_id = $_POST[\'rollNumber\'];
$query = "SELECT * FROM `wp_xenonresult` WHERE `student_id` = $student_id";
$result = $wpdb->get_row($query);
echo $result->student_name;
}
function display_shortcode() {
    ob_start();
    html_form_code();
    result_display();
    return ob_get_clean();
}

add_shortcode( \'xenon_result_display\', \'display_shortcode\' );
// Enable shortcodes in text widgets
add_filter(\'widget_text\',\'do_shortcode\');
?>

<?php /* Plugin Name: Xenon-Result Plugin URI: https://developer.wordpress.org/plugins/the-basics/ Description: Basic result display plugin. Version: 1.0 Author: Himanshu Gupta Author URI: https://developer.wordpress.org/ License: GPL2 License URI: https://www.gnu.org/licenses/gpl-2.0.html */ function installer(){ include(\'installer.php\'); } register_activation_hook( __file__, \'installer\' ); //executes installer php when installing plugin to create new database add_action(\'admin_menu\',\'result_menu\'); //wordpress admin menu creation function result_menu() { add_menu_page(\'Result\',\'Result\',\'administrator\',\'xenon-result\'); add_submenu_page( \'xenon-result\', \'Manage Marks\', \' Manage Marks\', \'administrator\', \'Manage-Xenon-Marks\', \'Xenon_Marks\' ); } function Xenon_Marks() { include(\'new/result-add-marks.php\'); } /*function Result_Form() { include(\'new/result-form.php\'); }*/ function html_form_code() { echo \'<form action="" method="post">\'; echo \'<fieldset>\'; echo \'<legend>Student Information</legend>\'; echo \'Roll Number: <input type="number" min="170001" max="171000" name="rollNumber"><br>\'; echo \'<input type="submit">\'; echo \'<input type ="reset">\'; echo \'</form>\'; } function result_display(){ global $wpdb; $student_id = $_POST[\'rollNumber\']; $query = "SELECT * FROM `wp_xenonresult` WHERE `student_id` = $student_id"; $result = $wpdb->get_row($query); echo $result->student_name; } if(isset($_POST[\'submit\'])) { result_display(); } function display_shortcode() { ob_start(); result_display(); html_form_code(); return ob_get_clean(); } add_shortcode( \'xenon_result_display\', \'display_shortcode\' ); // Enable shortcodes in text widgets add_filter(\'widget_text\',\'do_shortcode\'); ?>

插件放置在/wp-content/plugins内的文件夹中时不保存值

我得到了WordPRess插件的以下代码，它在每个页面/后期编辑屏幕上添加了两个自定义输入。然后将这些值保存并输出到前端页面的标题中。如果代码位于内部，则可以正常工作。php文件并直接放入“wp内容/插件”。然而，如果我把它放在插件（如“wp-content/plugins/myplugin”）中自己的文件夹中，那么在通过编辑屏幕保存帖子/页面时，输入字段不会保存。此外，它不会向前端页面html标题部分输出任何内容。这似乎是一个被放弃的项目，所以我无法与原始开发人员一起制定解决方案。然而，代码中的某些内容

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插件放置在/wp-content/plugins内的文件夹中时不保存值