What are common security measures used in PHP forums, such as security images during registration?

One common security measure used in PHP forums is the implementation of security images during registration. This is done to prevent automated bots from creating accounts and spamming the forum. By requiring users to enter a randomly generated code displayed in an image, it ensures that the registration is being done by a human. 

// Generate a random security code
$security_code = substr(md5(rand()), 0, 6);

// Store the security code in a session variable
$_SESSION['security_code'] = $security_code;

// Generate an image with the security code
$im = imagecreate(100, 30);
$background_color = imagecolorallocate($im, 255, 255, 255);
$text_color = imagecolorallocate($im, 0, 0, 0);
imagestring($im, 5, 5, 5, $security_code, $text_color);

// Output the image
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

Keywords

CAPTCHA CSRF protection input validation SQL injection prevention XSS protection

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