HTML表单PHP发布到自我以验证或提交到新页面

Upfront apology. Today is my first day working with php and I finally figured out how to get my page to post back to itself (I'd had the page as .html, instead of .php), but now I'm having trouble figuring out how to take the data to a new page after the form has been validated. I've been working on it for quite a while and I'm fried. Here's a simple example:Upfront apology. Today is my first day working