为什么我的字段在HTTP表单数据中时不在$ _POST中？

Question

I have an HTML form with method="POST" . There is a button with name="submit" in the form, plus a large number of hidden input fields with various names and values. I can see all the expected data coming through in the Request Header Form Data in my browser inspector. However, the submit field is not present in $_POST in the php script that is the form's action target.

What am I doing wrong?

Some extra tidbits:

• Changing the name of the button doesn't help. The new name is still in the Form Data but not in $_POST
• When I comment out all the hidden fields, it works fine
• The HTML passes validation
• The button has a non-empty value

Answer 1

The problem was that I needed up bump up the max_input_vars value in my php.ini file. The number of hidden inputs was greater than max_input_vars and so $_POST was getting truncated, leaving off my submit input var.