如何在函数外访问此变量

Question

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

我需要在别处回显 $ActiveWeekEndingDate 如何在函数之外正确访问它。

编辑：

我设法让它与以下一起使用，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;
}

Answer 1

为什么不在响应中处理？

$ActiveWeekEndingDate = GetActiveWeek();
echo $ActiveWeekEndingDate;

如果您坚持将其设置为全局（不鼓励），请在函数上方添加：

global $ActiveWeekEndingDate;

Answer 2

您需要将 GetActiveWeek 函数的 return 值分配给您可以从该函数访问的变量。

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

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

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;
}

这就是我取得结果的方式。我只是调用初始化变量的函数。

如何在函数外访问此变量

How do I access this Variable outside the function

php

mysql

variables

mysqli

var