A simple registration page is written. you can fill out the form and click Submit. no solution is displayed on the page.

A simple registration page is written. you can fill out the form and click Submit. the page does not respond and you click Submit. the page does not respond to the code: & lt; html & gt; & lt; head & gt; & lt; title & gt; registerpage & lt;/title & gt; & lt;/head writes a simple registration page. after entering the form, click submit, page no response
After filling out the form and clicking submit, the page does not respond
Code:


Register page


If (! Empty ($ _ POST ['submit '])
{
$ Username = $ _ POST ['username'];
$ Password = $ _ POST ['password'];
$ Verify_ps = $ _ POST ['verify _ PS'];
$ Email = $ _ POST ['email '];
$ Qq =$ _ POST ['QQ'];
}
If (! Isset ($ _ POST ['username'], $ _ POST ['password'], $ _ POST ['verify _ PS'], $ _ POST ['email '])
{
?>

}
Else {
$ Mysql = new mysqli ('localhost', 'webuser', '123 ');
If (! $ Mysql)
{
Echo "can't connect to db .";
Exit;
}
$ Select = $ mysql-> select_db ('user', $ mysql); // you can specify the currently activated database associated with the link identifier ($ mysql ).
If (empty ($ select ))
{
Die ("can't select to db .");
}
$ S_username = "select name = '". $ username. "' from picuser ";
$ S_email = "select e_mail = '". $ email. "' from picuser ";
$ Name_result = $ mysql-> query ($ s_username );
$ Email_result = $ mysql-> query ($ s_email );
$ N_row = $ name_result-> fetch_row ();
$ E_row = $ email_result-> fetch_row ();
If ($ n_row | $ e_row ){
Echo "this username has been registered .";
Exit;
}
$ Insert_user = "insert into picuser (name, password, e_mail, qq) values ('". $ username. "','". $ password. "','". $ email. "','". $ qq. "')";
$ Insert_result = $ mysql-> query ($ insert_user );
If ($ insert_result)
{
Die ('Insert data is fail .');
} Else {
Echo "you has registered successful! ";
}
}
?>



------ Solution --------------------
Standardized form writing.

------ Solution --------------------
Isn't it better to separate forms from PHP? Label with P? Is it meaningful to use teble!
------ Solution --------------------
A little long. it is better to separate html from php.