Html5-php form submit get method can submit get value but post method can not get

Source: Internet
Author: User
Tags php form php form submit
Why does php form submission use the get method to submit and obtain values, but the post method cannot be obtained? Notice: Undefinedindex: abcinC: xampphtdocsphpstromhello is always displayed. phponline2; that is to say, the post method fails to pass the value, and the directory is in c: xam... why can I use the get Method for php form submission to obtain the value while the post method cannot? It is always displayed:
Notice: Undefined index: abc in C: \ xampp \ htdocs \ phpstrom \ hello. php on line 2;
That is to say, the post method fails to pass the value. The directory is under the c: xampp/htdocs directory.

POST method:
HTML source code:

    
      Document

PHP source code:


  

Reply content:

Why can I use the get Method for php form submission to obtain the value while the post method cannot? It is always displayed:
Notice: Undefined index: abc in C: \ xampp \ htdocs \ phpstrom \ hello. php on line 2;
That is to say, the post method fails to pass the value. The directory is under the c: xampp/htdocs directory.

POST method:
HTML source code:

    
      Document

PHP source code:


  

This is only a warning, not an error. Generally, the solution is $ abc = isset ($ _ POST ['abc'])? $ _ POST ['abc']: '';

Check the Request Method and test your code. No problem.


  

In fact, you can use

var_dump($_POST);

Print the content entered at the front end to see if the key value is included.abc

Isset ($ _ POST ['abc'])? $ _ POST ['abc']: '';

Form
If the method is post, $ _ POST ['name'] is used.
If the method is get, use $ _ GET ['name'].

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