Question

I am trying to make a simple captcha in PHP just for learning purpose, not converting the string into image as of now, I can’t figure what I am doing wrong? I am not even able to verify the code, it’s giving string didn’t match every time

Here’s the code

    <?php


    $var = 'abcdefghijklmnopqrstuywxyz1234567890';

    $random = str_shuffle($var);

    $captcha = substr($random,0,10);
    echo $captcha;


    if(isset($_POST['captcha'])){

    $check = $_POST['captcha'];
    if ($captcha==$check){
    echo 'Verified.';

    }else{echo 'string didn\'t match';}

    }

    ?>
    <form action="random.php" method="POST">
    <input type="text" name="captcha"><br>
    <input type="submit" value="Submit">
    </form>

Answer 1

I don’t recommend this to use for captcha.

But i am correcting your code only for your learning purpose.

<?php

session_start();

if(isset($_POST['captcha'])){

$check = $_POST['captcha'];
if ($_SESSION['captcha']==$check){
echo 'Verified.';

}else{echo 'string didn\'t match';}

}

$var = 'abcdefghijklmnopqrstuywxyz1234567890';

$random = str_shuffle($var);

$captcha = substr($random,0,10);
echo $captcha;
$_SESSION['captcha'] = $captcha;

?>
<form action="random.php" method="POST">
<input type="text" name="captcha"><br>
<input type="submit" value="Submit">
</form>