The form problem is really wrong.

Normally, the following two forms are submitted. form in php: {code ...} echo. output in php: echo $ _ POST [& #039; username & #039;]; {code ...} isn't the form written in this way? It's hard to figure it out .....??? I also use XAMMP and... to submit the following two files in an ordinary form:

Form in form. php:

Output in echo. php:

Echo $ _ POST ['username'];

Why do I always report this prompt: Notice: Undefined index: username in/Applications/XAMPP/xamppfiles/htdocs/form/echo. php on line 8?

Isn't the form written in this way? It's hard to figure it out .....???
I also use XAMMP and PhpStorm. Is it related to tools ??
Many of Baidu's websites are making judgments.

if(isset($_POST['username'])){    echo $_POST['username'];}

In this case, there is certainly no Notice, but there is no output data ..

Reply content:

It is an ordinary form that submits the following two files:

Form in form. php:

Output in echo. php:

Echo $ _ POST ['username'];

Why do I always report this prompt: Notice: Undefined index: username in/Applications/XAMPP/xamppfiles/htdocs/form/echo. php on line 8?

Isn't the form written in this way? It's hard to figure it out .....???
I also use XAMMP and PhpStorm. Is it related to tools ??
Many of Baidu's websites are making judgments.

if(isset($_POST['username'])){    echo $_POST['username'];}

In this case, there is certainly no Notice, but there is no output data ..

Set the enctype attribute of FORM.

Http://www.w3school.com.cn/tags/att_form_enctype.asp

SetusernameTry another word.

Are you sure you want to accept the php script echo. php?

The code is okay. I ran it again. I guess the possible reason is the php configuration problem. You need to add a few more inputs and Print $ _ POST on the receiving page, it is estimated that no post can be received. Try again with get.

Print $ _ POST directly to see which variables are received

Thanks for your answers. The problem has been solved. The problem is my access path. I accessed localhost: 63342/this port has accessed all the web servers in phpStorm and I have enabled Apache WebServer.
You only need to change the path to http: // localhost/form. php. Maybe kumfo has found the problem, but I don't know how to issue the file structure.