SQL中的PHP全局变量[关闭]

Question

I am trying to search my MySQL database based on a globalvariable but this is not functioning. Here is my code below. Ants hints will be appreciated.

if (!isset($Whatis)) {
    echo "Value for Whatis is not set";
} else {
     echo $Whatis ;
}
function PullOver($Monthselect) {
    $dateY = date("Y");
    $Valforthis = "select global $Whatis from graph where month = '$Monthselect' and year = '$dateY'";
    echo $Valforthis ;
    $retrieve = mysql_query($Valforthis);
    $Val = mysql_fetch_array($retrieve);
    echo $Val['$Whatis'] ;
}
PullOver('January');

Answer 1

You have to update the 2nd line of the function PullOver to:

$Valforthis = "select ".$GLOBALS['Whatis']." from graph where month = '$Monthselect' and year = '$dateY'";