php - Call to a member function bind_param() on a non-object

I am trying to bind a variable in this prepared statement, but i keep receiving the error:

Call to a member function bind_param() on a non-object

The function is called, and variables are passed to it. When i change the function to just echo the variable, the variable prints on the page fine, but if i try to bind it here i receive the error. can anyone help?

//CALL FROM PAGE ONE
check($username);

//FUNCTION ON PAGE 2
function check($username){

$DBH = getDBH();
$qSelect = $DBH->prepare("SELECT * FROM users WHERE username = ?");
$qSelect->bind_param("s", $username);
}

i know the function is not completely written here, but that shouldn't be a problem. I don't understand why i am receiving this error.

Answer

as the error-message says, $qSelect seems to be not an object. try to debug this by using var_dump($qSelect); right after your prepare-call. also check if getDBH() returns what you need.

sounds like the prepare-call fails (don't know why) and so it returns false - false is not an object, so you can't call bind_param() on that.

EDIT: you havn't given the info, but it looks like you're using PHP's PDO. In that case, take a look at the documentation.

If the database server successfully
prepares the statement, PDO::prepare()
returns a PDOStatement object. If the
database server cannot successfully
prepare the statement, PDO::prepare()

returns FALSE or emits PDOException
(depending on error handling).

You should configure your server to return those PDO-Exceptions, which would tell you why the prepare call fails.