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Editorial Team
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Asked: 2026-06-13T23:06:47+00:00

I’m trying to do the push-and-pop stack array in PHP but only the last

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I’m trying to do the push-and-pop stack array in PHP but only the last value is stored. How can I store the other values as well even if I click on the button again & load the same page?
This is what I’ve done:

<?php
    if(!$_GET)
        $myStack = array();
    else
        $myStack[] = "";
?>

<html>
<head> <title>Exercise</title>
</head>
<body>
    <form action="test.php" method="get">
        Element: <input type="text" name="num"  value="0"/><br/>
        <input type="submit" name="push" value="push" />
        <input type="submit" name="pop" value="pop" />
    </form>

<?php

    if(isset($_GET["push"])){
        array_push($myStack, $_GET["num"]);
        foreach($myStack as $val)
            echo $val . " ";
    }
    elseif(isset($_GET["pop"])){
        array_pop($myStack);
        foreach($myStack as $val)
            echo $val . " ";
    }
?>
</body>
</html>
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1 Answer

  1. Editorial Team

    Every http request php will execute script with all variables from scratch. You have to use $_SESSION or static variables to save values between requests.
    To store array in $_SESSION just assign it to key:

    $_SESSION["myStack"] = array();
$_SESSION["myStack"][] = 1;
$_SESSION["myStack"][] = 2;
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