PHP Script executes after Refresh

Question

i have a Button, that executes php Code after click(I am testing something with EMails and everything is working so far, except this Issue with the "PHP Script loading after Refresh" Problem):

HTML:

<form method="post"> 
<input type="submit" name="button1"
        class="button" value="Button1" /> 

<input type="submit" name="button2"
        class="button" value="Button2" /> 
</form>

PHP:

<?php
    if(array_key_exists('button1', $_POST)) { 
        button1(); 
    } 
    else if(array_key_exists('button2', $_POST)) { 
        button2(); 
    } 
    function button1() { 
        echo "mail"; 
    } 
    function button2() {
            ini_set( 'display_errors', 1 );
            error_reporting( E_ALL );
            $from = "[email protected]";
            $to = "[email protected]";
            $subject = "Betreff";
            $message = "Text";
            $headers = "From:" . $from;
            mail($to,$subject,$message, $headers);
            echo "Test email sent";
    } 
?>

When i first go to the Site, everything is working and the script is not executing, before I press one of the Buttons. Thats perfect -> BUT when I refresh the Page, the script gets executed without me pressing the Button.

How can I prevent the script loading after refresh?

Check this. Meta tag should help stackoverflow.com/questions/10643626/… — DuhVir
– DuhVir, Commented Apr 16, 2020 at 11:46
Thanks @DuhVir header("Refresh: 0"); // here 0 is in seconds worked for me but thats not totally what i wanted, if I refresh the Page, then everything insertet might get Lost :/. — yama_HD
– yama_HD, Commented Apr 16, 2020 at 12:14
@yama_HD ok. Than look at this yourhowto.net/detect-page-refresh-php session(varian 2) is a good choise, like said Kristian above — DuhVir
– DuhVir, Commented Apr 16, 2020 at 12:28

Kristian · Accepted Answer · 2021-08-10 04:33:35Z

1

Showing that kind of message is often called "flash message": showing a message that appear once, and not showing again after refresh.

Your problem comes from browser's behavior: if a page is loaded from a POST request, then if user hit refresh button, it will make a new POST request with same POST parameter

But what you want is: if a page is loaded from a POST request, then if user hit refresh button, it will make a new GET request (of course: without any POST parameter)

It can be achieved by using session, the step is as follows:

user click a button (1 or 2)
POST to self button1=Button1 or button2=Button2
Page processing the request (do the mail function)
Page redirect / refresh to show the new message that previously saved in session variable.


<?php
    session_start();

    if(array_key_exists('button1', $_POST)) {
        button1();
    }
    else if(array_key_exists('button2', $_POST)) {
        button2();
    }
    function button1() {
        $_SESSION["msg"] = "mail";
        echo "<script>window.location = window.location.pathname;</script>";
        exit();
    }
    function button2() {
        ini_set( 'display_errors', 1 );
        error_reporting( E_ALL );
        $from = "[email protected]";
        $to = "[email protected]";
        $subject = "Betreff";
        $message = "Text";
        $headers = "From:" . $from;
        mail($to,$subject,$message, $headers);
        $_SESSION["msg"] = "Test email sent";
        echo "<script>window.location = window.location.pathname;</script>";
        exit();
    }

?>
<form method="POST">
<input type="submit" name="button1"
        class="button" value="Button1" />

<input type="submit" name="button2"
        class="button" value="Button2" />
</form>

<?php
if(!empty($_SESSION["msg"])){
    echo $_SESSION["msg"];
    $_SESSION["msg"] = null;
    unset($_SESSION["msg"]);
}
?>

edited Aug 10, 2021 at 4:33

answered Apr 16, 2020 at 12:15

Kristian

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3 Comments

yama_HD Over a year ago

Well its working now but my Inputs are no longer there because the page refreshed, thats not soo good

Kristian Over a year ago

then either use ajax, or just save the input in another session variable

Kristian Over a year ago

@mickmackusa thanks, it's an answer long ago that I haven't checked. Answer edited

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