php重定向脚本无法正常工作

Question

require "assets/php/config.php";
error_reporting(E_ALL);

$location = null;

if(isset($_GET['l']))
{

$location = retrieveAddress($_GET['l']);
}
if($location != null){

    header('Location: ' . $location);
}
else{
    header('HTTP/1.0 404 Not Found');
    echo 'Unknown link.';
}



public static function retrieveAddress($name)
    {
        $con = new PDO(Config::$host,
                  Config::$user,
                  Config::$password);
        if (!$con) {
    die('Could not connect: ' . mysql_error());
        }

        $sql = $con->prepare('SELECT address FROM links WHERE name = ?');
        $sql->execute($name);
        $location = $sql->fetchAll(PDO::FETCH_ASSOC);

        $con = null;

        return $location;

    }

This script should allow me to go to my database where I save links and then redirect to that location, made it while working on a simple url shortener, I can easily add links so the database configuration works, however when I try to retrieve here nothing appears. I also tried to use error_reporting(E_ALL); but I still get nothing. Anyone got any idea, see anything wrong I fail to see?(I m sure there is something wrong but I can't notice

*Edit: I reach the file via link, no ajax is used. I removed all the text echos and I don t know how to check the value of the $location to see if I'm getting the proper value without using echo, I also edited the mysql to grab only the address, I was also getting the name, which was another mistake, but I seem to have one more somewhere.

Answer 1

Forget my comment, i just saw you're sending output:

echo "before all";

before sending your headers. Thats a big no-no. You never send output before redirecting and generally never send headers after output. That includes whitespace as well.

Additionally, the $location is remaining NULL through all the script since you're changing it from retrieveAddress, yet since your variable is a global you either need to declare it as global $location inside function or access it as $GLOBALS["location"]

It would be easier if you just returned the $location from function also.

UPDATE

Apparently, the error was using public static outside of a class

public static function retrieveAddress($name)
    {

The result was that somehow server got confused without returning any error or output. The only clue we got (me and OP) was that mysterious message through firebug Reload the page to get source for... One can find more info about this message here.

So, in case anyone get funny responses from his server, without errors, better check for cases like the above.