Why can't $_POST get the value?

Reply content:

There is a bug in phpstorm’s built-in server post, you can use PHP’s built-in server instead

See my previous solutions

https://segmentfault.com/q/1010000005685200/a-1020000005685414

Why should we write html in the php file? .

Debug and see the results! Directly in the php filevar_dump($_POST); see if it is valuable

The reason is that you write the PHP code directly in HTML,

// HTML CODE

if ($_POST['a'] && $_POST['b'])
{
    //CODE..
}

Written like this, when you getrequest, because $_POST is space-time at this time, an undefined parameter error will occur,

So are you sure you postrequested?