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Editorial Team
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Asked: 2026-06-09T20:56:52+00:00

I am building a simple antibot for my email form. This is a code

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I am building a simple antibot for my email form.
This is a code which makes a problem:

<?php
    session_start();
    $a = rand(1, 10);
    $b = rand(1, 10);
    $antibot = $a + $b;
    $_SESSION["antibot"] = $antibot;
?>
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
$(document).ready(function(){
    $("#sendEmail").click(function(){
            var antibot = $("#antibot").val();
        $.post(
            "test.php",
            {antibot: antibot}, 
            function(data){
                    alert(data.info);
            }, 
            "json"
            );
        );
    );
);
    </script>
    </head>
    <body>
    <table>
        <tr><td>AntiBot: <?php echo $a . ' + ' . $b;?> = </td><td><input type='text' id='antibot' /></td></tr>
        <tr><td colspan='2'><input type='button' id='sendEmail' value='Send'/></td></tr>
    </table>
    </body>
    </html>

And my test.php

<?php
    session_start();
    $antibot = $_POST["antibot"];
    $data = array();
    if(isset($_SESSION["antibot"])){
        if($_SESSION["antibot"] == $antibot){
            $data["info"] = "Session is isset and answer is right!";
        }
        else{
            $data["info"] = "Session is isset but answer is NOT right!";
        }
    }
    else{
        $data["info"] = "Session is NOT isset!";
    }
    echo json_encode($data);
?>

I constantly get this info: “Session is isset but answer is NOT right!”
If you can see $_SESSION[“antibot”] in test.php is setted but value is "" no matter what I type in input field #antibot!

I do not understand why this is happening, please can someone tell me where the problem is and how can I fix it?

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1 Answer

  1. Editorial Team

    I tested this code here:
    http://onlinephpfunctions.com/stackoverflow/11981309/

    And it seems completely valid.

    I had to make some modifications to your javascript:

    <script type="text/javascript">
$(document).ready(function(){
    $("#sendEmail").click(function(){
            var antibot = $("#antibot").val();
        $.post(
            "test.php",
            {antibot: antibot}, 
            function(data){
                alert(data.info);
            }, 
            "json"
           )
    })

})
    </script>

    After that it was working fine. It may just be some problems with cookies in your browser, or an error in your PHP config so sessions wont be stored right. Please check this, your code works OK, as you can see in the demo.

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