$ _SESSION变量没有被替换？

Question

第二位代码我需要替换当前的SESSION变量，而不是添加一个新变量。例如：$ _SESSION ['client'] = 254921，然后第二位的if语句应该用从我的$ _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.如何使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

替换它：

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

由此：

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

我希望这会有所帮助。