When PHP applies post to transfer data, action = "login. php? Id = 2 "click to submit, $ _ POST [" id "] cannot be displayed, that is, it is not set

When PHP uses post to transmit data, action & quot; login. php? Login. php ?, Click SUBMIT. $ _ POST [id] cannot be displayed, that is, it is not set! However, for example, when PHP uses post to transmit data, action = "login. php? Id = 2 ", click submit, $ _ POST [" id "] cannot be displayed, that is, it is not set!
PHP sets action = "login. php? Id = 2 ",
Click SUBMIT. $ _ POST ["id"] cannot be displayed, that is, it is not set! But other,
For example, the value of $ _ POST ["name"] exists.

The original plan was to judge by the value of id. However, the same php page processes different requests,
Please help!

If you have money, you may have money or someone else.

PHP Form action $ _ POST []

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------ Solution --------------------
$ _ GET ['id'] is required for parameters above the url;