我如何在函數外部訪問此變量

Question

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

我需要在其他地方回顯$ ActiveWeekEndingDate，如何在函數外部正確訪問它。

編輯：

我設法使它與“跟隨”一起使用，但是准備聲明不是很必要嗎？

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

為什么不在響應中處理呢？

$ActiveWeekEndingDate = GetActiveWeek();
echo $ActiveWeekEndingDate;

如果您堅持要全局使用（不推薦使用），請在函數上方添加以下代碼：

global $ActiveWeekEndingDate;

Answer 2

您需要將GetActiveWeek函數的返回值分配給可以從該函數訪問的變量。

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;
}

這就是我取得結果的方式。 我只是調用初始化變量的函數。