从POST获取转储php变量

Question

I have some PHP code running at the top of my page

if(isset($_POST['arrow1']) and isset($_POST['arrow2'])) {....}

And a form that sends data to this page. What i want to do is to empty the variables once the php code at the top runs so that on refresh it won't run again.

How can i achieve that?

Thank you

Answer 1

I know the question is a little bit outdated but....

Your form will run only once... or everytime... depending on how you load the page. If the form submits POST, unsetting is kind of sinceless. Let´s say the form on the top says: Push button and submit "hello world". You push the button, page get´s load (and since you dont use ajax, it has to load new), "hello world" is submitted and after submit POST get´s unset. Form is still there.. you press button again... same thing happens again. To avoid this you propably have to use $_SESSION

Sample

if((!isset($_SESSION['arrowsWasSet'])) 
{
    if(isset($_POST['arrow1']) and isset($_POST['arrow2']))
    {
        unset($_POST);
        $_SESSION['arrowWasSet'] = true;
    }
}

other way is to store data into the session and check if its already set to session.

if(isset($_POST['arrow1']) && isset($_POST['arrow2'])) 
{
    if(!isset($_SESSION['arrows']))
    {
        $_SESSION['arrows']['arrow1'] = $_POST['arrow1'];
        $_SESSION['arrows']['arrow2'] = $_POST['arrow2'];
    }
    unset($_POST); 
    //you can call this to get a clean post everytime, but no need.
}

do you have a type in there ? i mean shouldnt this mean array1 instead of arrow1 ? :)

anyways, $_SESSION survives the refresh. So after refreshing the page, you can still check if something happend. To empty session you could do:

• session_destroy (kills hole session)
• restart your Browser (not refresh, totaly restart! kills hole session)
• hitting keys ALT + F5 (kills hole session)
• clear Browsercache manualy (kills hole session)
• $_SESSION['xy'] = NULL; (kills parts in session)
• unset($_SESSION['xy']); (kills parts in session)