How To Add Captcha In Opencart

Now Captcha means “Completely Automated Public Turning Test to tell Computers and Humans Apart” is most often used in every registration page to check whether the user is human or not. If you are a opencart developer you can add captcha in your website.Here is the code for captcha.

View file –

<img src="index.php?route=module/demo/captcha" alt="" id="captcha" />

Controller file –

public function captcha() {
		$this->session->data['captcha'] = substr(sha1(mt_rand()), 17, 6);

		$image = imagecreatetruecolor(150, 35);

		$width = imagesx($image);
		$height = imagesy($image);

		$black = imagecolorallocate($image, 0, 0, 0);
		$white = imagecolorallocate($image, 255, 255, 255);
		$red = imagecolorallocatealpha($image, 255, 0, 0, 75);
		$green = imagecolorallocatealpha($image, 0, 255, 0, 75);
		$blue = imagecolorallocatealpha($image, 0, 0, 255, 75);

		imagefilledrectangle($image, 0, 0, $width, $height, $white);
		imagefilledellipse($image, ceil(rand(5, 145)), ceil(rand(0, 35)), 30, 30, $red);
		imagefilledellipse($image, ceil(rand(5, 145)), ceil(rand(0, 35)), 30, 30, $green);
		imagefilledellipse($image, ceil(rand(5, 145)), ceil(rand(0, 35)), 30, 30, $blue);
		imagefilledrectangle($image, 0, 0, $width, 0, $black);
		imagefilledrectangle($image, $width - 1, 0, $width - 1, $height - 1, $black);
		imagefilledrectangle($image, 0, 0, 0, $height - 1, $black);
		imagefilledrectangle($image, 0, $height - 1, $width, $height - 1, $black);

		imagestring($image, 10, intval(($width - (strlen($this->session->data['captcha']) * 9)) / 2), intval(($height - 15) / 2), $this->session->data['captcha'], $black);

		header('Content-type: image/jpeg');

		imagejpeg($image);

		imagedestroy($image);
	}

Result –