Plugin form unable to process

我正在使用短代码来处理我的HTML表单。但是，提交后不会显示任何结果。我不会走错方向。

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

//result display form begins

function display_result_form_fields(){
    ob_start(); ?> 
        <form id="result_form" action="" method="POST">
            <fieldset>
                <p>
                    <label for="rollNumber"><?php _e(\'Roll Number\'); ?></label>
                    <input name="rollNumber" id="rollNumber" class="required" type="number"/>
                </p>
                <p>
                    <input type="submit" value="<?php _e(\'Submit\'); ?>"/>
                </p>
            </fieldset>
        </form>
    <?php
    return ob_get_clean();
}

function form_processing(){
if(isset($_POST[\'Submit\'])){
    global $wpdb;
    $student_id = $_POST[\'rollNumber\'];
    $query = "SELECT * FROM `wp_xenonresult` WHERE `student_id` = $student_id";
    $result = $wpdb->get_row($query);
    echo "Dear student, congratulations";}
}

//shortcode begins here
function result_form() {
            form_processing();
            $output = display_result_form_fields();
            return $output;
    }

add_shortcode(\'result_form\', \'result_form\'); //create shortcode
add_filter(\'widget_text\',\'do_shortcode\'); // Enable shortcodes in text widgets
?>

<?php function installer(){ include(\'installer.php\'); } register_activation_hook( __file__, \'installer\' ); //executes installer php when installing plugin to create new database //result display form begins function display_result_form_fields(){ ob_start(); ?> <form id="result_form" action="" method="POST"> <fieldset> <p> <label for="rollNumber"><?php _e(\'Roll Number\'); ?></label> <input name="rollNumber" id="rollNumber" class="required" type="number"/> </p> <p> <input type="submit" name = "submit" value="Submit"/> </p> </fieldset> </form> <?php return ob_get_clean(); } function form_processing(){ global $wpdb; $student_id = $_POST[\'rollNumber\']; $query = "SELECT * FROM `wp_xenonresult` WHERE `student_id` = $student_id"; $result = $wpdb->get_row($query); echo "Dear ".$result->", "; } //shortcode begins here function result_form() { ob_start(); if(isset($_POST[\'submit\'])){ form_processing(); } else{ $output = display_result_form_fields(); return $output; } return ob_get_clean(); } add_shortcode(\'result_form\', \'result_form\'); //create shortcode add_filter(\'widget_text\',\'do_shortcode\'); // Enable shortcodes in text widgets ?>

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