Variable variable not working

Question

I have some code that doesn't seem to work. I'm using a form to post a value (green, blue, red, etc) and make it look up something in the database using that post value as part of a variable name.

$mine = 'green';

$querymine = $dbcon->prepare('SELECT * FROM mine WHERE playerid = :playerid');
$querymine->execute(array(
    'playerid' => $playerid
));
$rowmine = $querymine->fetch(PDO::FETCH_ASSOC);

if (${'rowmine[\'has'.$mine.'\']'} == 0) {
    header("location:mine.php");
    die();
}

It is looking up the column "hasgreen", which is INT 4 in this case. The problem is, it tells me that $rowmine['hasgreen'] is NULL, thus I'm getting kicked back to "mine.php". I'm not sure what the problem is, maybe the use of \' in the variablename?

Answer 1

You have an array. There is no reason to use a variable variable here.
You can simply use $rowmine['has'.$mine] instead!

Since you are probably a beginner: If you use variable variables you should always consider using an array instead. Variable variables are a great way to get unreadable spaghetti code.

Answer 2

No need for the {}, try this:

 if ($rowmine['has'.$mine] == 0)