Research on parameters passing in PHPform

Recently, I have been working on a uchome-based secondary development website, because many of the uchome redirects are controlled by the do parameter, and this mechanism is not very detailed, there is always a feeling of fog. Why? Because there are two types of form processing: GET and POST, how to pass the do parameter in both forms, in addition, it has always been a confusing issue to obtain data in the same way in the background. after several hours of experimentation, I finally understood this article.
GET form:

       
      Use GET to pass values in a form       
        

PHP for processing GET forms:

Processing result output:
The value of the parameter name is obtained as kj through $ _ GET, the value of the parameter name is obtained through $ _ POST, and the value of the parameter name is obtained as kj through $ _ REQUEST.
The value of parm is obtained through $ _ GET, the value of parm is obtained through $ _ POST, and the value of parm is obtained through $ _ REQUEST.
The hkey value is obtained as hvalue through $ _ GET. the hkey value is obtained through $ _ POST, and the hkey value is obtained as hvalue through $ _ REQUEST.
The do value of the parameter is obtained as index through $ _ GET, the do value of the parameter is obtained through $ _ POST, and the do value of the parameter is obtained as index through $ _ REQUEST.
POST form:

       
      The form uses POST to pass values.       
        

PHP for processing POST forms:

Processing result output:
The value of the parameter name is obtained through $ _ GET. The value of the parameter name is obtained as zkj through $ _ POST, and the value of the parameter name is obtained as zkj through $ _ REQUEST.
The value of parm is obtained as url-post through $ _ GET, the value of parm is obtained through $ _ POST, and the value of parm is obtained as url-post through $ _ REQUEST.
The value of the hkey is obtained through $ _ GET, and the value of the hkey is obtained as hvalue through $ _ POST. The value of the hkey is obtained as hvalue through $ _ REQUEST.
The do value of the parameter is obtained as index through $ _ GET, the do value of the parameter is obtained through $ _ POST, and the do value of the parameter is obtained as index through $ _ REQUEST.
Conclusion:
The GET form value can be obtained through _ GET, but the parameter set through the url parameter of action cannot always be obtained.
The POST form value can be obtained through _ POST, but the parameter set through the action url parameter can be obtained through _ GET
The same variable can be obtained through _ GET, but the variable setting is hidden in the GET form. in the POST form, the variable is set through the url parameter of action.

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