PHP action= "login.php?id=2" click Submit when applying POST to transmit data, $_post["id" cannot be displayed, i.e. not set

PHP in the use of POST data, action= "login.php?id=2", click Submit, $_post["id"] can not be displayed, that is not set!
PHP sets action= "login.php?id=2" when using post to pass form form data,
Click Submit, use $_post["id"] can not display, that is not set! But the others,
For example, the value of $_post["name") is present

The original plan is judged by the value of the ID, and the same PHP page handles different requests.
Please help us!

Money to hold a court, someone's personal field. PHP Form Action $_post[]

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------Solution--------------------
The parameters above the URL must be $_get[' id '];

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