在php中只初始化一次变量 [英] Initialize the variable only once in php

问题描述

我遇到了一个问题，我只需要初始化会话变量一次.当他点击提交并返回同一页面时，应该更改变量值.

I am stuck in a problem where I need to initialize the session variable only once. When he hits submit and comes back to the same page, the variable value should be changed.

我的 index.php 代码是这样的:

My index.php code is something like this:

<?php
session_start();
$_SESSION['session_variables_updated'] = 0;
?>
<form name="" method="post" action="index2.php">
    <input type="submit" value="Submit" name="Submit">
</form>

if ($_SESSION['session_variables_updated'] == 1) {
    //do something
}

我的index2.php是:

<?php $_SESSION['session_variables_updated'] = 1; ?>
<a href="index.php">back</a>

但是由于变量再次被初始化，所以每次都设置为0.关于这个问题的任何指导?

But since the variable is again being initialized, it is set to 0 every time. Any guidance on this problem?

推荐答案

index.php

<?php
session_start();
if(!isset($_SESSION['session_variables_updated'])){
    $_SESSION['session_variables_updated']=0;
}
?>
<form name="" method="post" action="index2.php">
    <input type="submit" value="Submit" name="Submit">
</form>
<?php
if ($_SESSION['session_variables_updated'] ==1){
//do something
}


?>

请试试这个.我在这里做了什么，我只是检查了会话变量是否已分配或设置，如果它不可用，我将零分配给它.否则我允许它执行其他操作.

Please try this. What i have done here, I just checked the session variable is allocated or setted or not if it is not available the i assign the zero to that . otherwise i allow it to perform another actions.

在您的第二页中，您应该先开始会话，然后再使用会话进行操作

in your 2nd page you should start session before doing somethings with sessions

<?php
session_start();
$_SESSION['session_variables_updated'] = 1;
?>
<a href="index.php"> back </a>

这肯定会奏效，请试一试.这在我的情况下有效

Defenitly this will work pleaase have a try. this is working in my case

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