我如何在函数外部访问此变量

Question

function GetActiveWeek($mysqli, $ActiveWeekEndingDate) {
    $stmt = "SELECT ParameterValue FROM INF_WebConfig WHERE ParameterName = 'ActiveWeekEndingDate'";
    $ActiveWeekEndingDate = $mysqli->query($stmt);
    return $ActiveWeekEndingDate;
}

I need to echo $ActiveWeekEndingDate elsewhere how do I access this outside of the function correctly.

EDIT:

I managed to get it working with the Following but it isn't really nessicary to prepare the statement is it?

function GetActiveWeek($mysqli) {
    $stmt = $mysqli->prepare("SELECT ParameterValue FROM INF_WebConfig WHERE ParameterName = 'ActiveWeekEndingDate'"); 
    $stmt->execute();
    $stmt -> bind_result($ActiveWeekEndingDate);
    $stmt -> fetch();
    $stmt -> close();
    $mysqli -> close();
    return $ActiveWeekEndingDate;
}

Answer 1

Why not handle it in the response?

$ActiveWeekEndingDate = GetActiveWeek();
echo $ActiveWeekEndingDate;

If you insist on having it global (discouraged), add this above the function:

global $ActiveWeekEndingDate;

Answer 2

You need to assign the return value from the GetActiveWeek function to a variable you can access out of the function.

function GetActiveWeek($mysqli, $ActiveWeekEndingDate) {
        $stmt = "SELECT ParameterValue FROM INF_WebConfig WHERE ParameterName = 'ActiveWeekEndingDate'";
        $ActiveWeekEndingDate = $mysqli->query($stmt);
        return $ActiveWeekEndingDate;
}

$retVal = GetActiveWeek($mysqli, $ActiveWeekEndingDate);

Answer 3

function GetActiveWeek($mysqli) {
    $stmt = $mysqli->prepare("SELECT ParameterValue FROM INF_WebConfig WHERE ParameterName = 'ActiveWeekEndingDate'"); 
    $stmt->execute();
    $stmt -> bind_result($ActiveWeekEndingDate);
    $stmt -> fetch();
    $stmt -> close();
    $mysqli -> close();
    return $ActiveWeekEndingDate;
}

This was how i achieved the result. I just call the function where the variable is initialized.