如何在函数外访问此变量答案

【问题标题】：How do I access this Variable outside the function如何在函数外访问此变量
【发布时间】：2016-06-11 20:07:21
【问题描述】：

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显 $ActiveWeekEndingDate 如何在函数之外正确访问它。

编辑：

我设法让它与以下内容一起工作，但准备声明并不是真的必要吗？

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;
}

【问题讨论】：

只要调用这个函数，它就会返回$ActiveWeekEndingDate。 echo GetActiveWeek($mysqli, $ActiveWeekEndingDate);

标签： php mysql variables mysqli var

【解决方案1】：

为什么不在响应中处理呢？

$ActiveWeekEndingDate = GetActiveWeek();
echo $ActiveWeekEndingDate;

如果您坚持将其设为全局（不鼓励），请将其添加到函数上方：

global $ActiveWeekEndingDate;

【讨论】：

【解决方案2】：

您需要将 GetActiveWeek 函数的返回值分配给您可以在函数外访问的变量。

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

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

【讨论】：

【解决方案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;
}

这就是我实现结果的方式。我只是调用初始化变量的函数。

【讨论】：