为什么我的echo变量在提交时不显示？

Question

我正在为php学校项目工作我有2个文件，checkBlank.php和form.php。一切都正确显示并且提交表单很好，但它没有显示未填写的字段的echo $消息。

以下是代码：

if(isset($_POST['submitted']) and $_POST['submitted'] == 'yes') {
    foreach($_POST as $field => $value) {
        if(empty($value)) {
            $blank_array[] = $field;
        }

        else {
            $good_data[$field] = strip_tags(trim($value));
        }
    }

    if(@sizeof($blank_array) > 0) { 
        $message = "<p style ='color: red; margin-bottom: 0; font-weight: bold'>

                                        You have not filled in all the fields.
                                        Please fill in the:

                        <ul style='color: red; margin-top: 0; list-style: none' >";

            foreach($blank_array as $value) {
                $message .= "<li>$value</li>";
            }
            $message .= "</ul>";

            echo $message;

            extract($good_data);
            include ("form.inc");
            exit();

    }
    echo "All fields contain information";
}

else {
    include("form.inc");
}