How can the PHP script be modified to ensure that the captcha code is always refreshed and valid for each new request?

To ensure that the captcha code is always refreshed and valid for each new request, you can add a line of code to generate a new captcha code every time the form is loaded. This can be achieved by regenerating the captcha code and image before displaying the form. 

<?php
session_start();

// Generate a new captcha code
$captcha_code = substr(md5(rand()), 0, 6);
$_SESSION['captcha_code'] = $captcha_code;

// Create a new captcha image
$captcha_image = imagecreate(100, 30);
$bg_color = imagecolorallocate($captcha_image, 255, 255, 255);
$text_color = imagecolorallocate($captcha_image, 0, 0, 0);
imagestring($captcha_image, 5, 5, 5, $captcha_code, $text_color);

// Output the captcha image
header('Content-type: image/png');
imagepng($captcha_image);
imagedestroy($captcha_image);
?>

Keywords

PHP captcha refresh validation request

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