Paypal Button不适用于PHP

I having a problem with my code every time I click the paypal button it just post the information in my URL but do not redirect to paypal.

Here's my code. I can't post it since it is too long.

http://pastebin.com/aHPirpPr

Thanks in advance

There seems to be a second <form> on your page. Which has the Update button. I'm guessing you're submitting the empty form?

Make sure that your form looks like this:

<form action="toPayPal">
    /* fields here */
    <input type="button" value="Click me!" />
</form>

and not:

<form action="toPayPal">
    /* fields here */
</form>
<form>
    <input type="button" value="Click me!" />
</form>

Because in the latter case you're submitting an empty form. You can't split up forms like this.