php - $_SESSION 变量没有被替换？

Question

第二段代码我需要替换我当前的 SESSION 变量，而是添加一个新变量。例如：$_SESSION['client'] = 254921，然后第二位的 if 语句应该用我的 $_POST 变量输入的新语句替换它。但相反，如果我将其更改为 254922，$_SESSION['client'] 现在等于 254921 和 254922。如何让 254922 替换 254921？谢谢。

<?php
if(empty($_SESSION['client']) || empty($_SESSION['hash'])) {
        $secrets = mysql_fetch_array(mysql_query("SELECT * FROM `secrets`"));
        $_SESSION['client'] = rand(100000, 999999);
        $_SESSION['rand'] = rand(0, 10000)/100;
        $_SESSION['hash'] = hash('sha512', $_SESSION['rand'] . $_SESSION['client'] . $secrets['secret'] );


 }
 ?>

<?php
    if(!empty($_POST['client']) 
&& strlen($_POST['client']) == 6 
&& is_numeric($_POST['client'])) {

    $_SESSION['client'] = $_POST['client'];


}
?>

Answer 1

替换这个：

$_SESSION['client'] = $_POST['client'];

这样：

unset($_SESSION['client']); // this will unset the variable $_SESSION['client']
$_SESSION['client'] = $_POST['client'];

我希望这会有所帮助。