What steps can be taken to troubleshoot issues with captcha not being displayed in a PHP form?

If the captcha is not being displayed in a PHP form, it could be due to incorrect integration of the captcha code or a server-side issue. To troubleshoot this, make sure the captcha code is properly included in the form HTML, check for any errors in the PHP code that generates the captcha image, and ensure that the server has the necessary GD library installed. 

<?php
// Check if GD library is installed
if (!function_exists('imagecreatetruecolor')) {
    die('GD library is not installed');
}

// Generate captcha image
$width = 200;
$height = 50;
$image = imagecreatetruecolor($width, $height);
$bg_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 0, 0, 0);
imagestring($image, 5, 50, 20, 'Captcha', $text_color);

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

Keywords

captcha troubleshooting PHP form display issue error detection

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