在重定向函数中使用变量

Question

With PHP, I have a script that searches for an email from a mysql_db then takes a username from the same row as the email in the db. What I want it to do is redirect using the username as a subdomain in the url

I've tried:

 $username = //username taken from the db
 $url = 'http://".$username."domain.com';
 header('location: $url');

This just appends the variable "$url" to the end of my test url.

and I've tried:

header('http://".$username."domain.com');

This outputs in the adress bar:

http://%22.%24account_name.%22.domain.com

How can use this search result variable and redirect to the subdomain I am looking for?

Answer 1

You have syntax errors galore.

Version 1 corrected (variables in single quotes are treated as literal strings):

$username = //username taken from the db
$url = 'http://".$username."domain.com';
header('location: ' . $url);

Version 2 corrected (Your syntax and quote usage are both wrong):

header("Location: http://".$username."domain.com");