php - 通过循环定义常量

Question

我尝试通过循环定义常量值，但出现错误：

Notice: Use of undefined constant XXXXX - assumed 'XXXXX' in XX on line XX

这是代码：

$q = "SELECT `Key`, `Value` FROM appconfig";
//I skip the line to read from database
while($fetch = mysqli_fetch_array($r)) {
    define("'" . $fetch["Key"] . "'", $fetch["Value"]);
    //I try to echo $fetch["Key"] and $fetch["Value"] and it returns value
}

代码有问题吗？我试图手动定义它并且它有效。

Answer 1

不要使用引号，你不需要它们：

define($fetch["Key"], $fetch["Value"]);