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localhost/misitio/administracion/generarcaptcha

class Administracion_CaptchaController extends Zend_Controller_Action {
	#
	public function init() #
	{
		#
		$this->_helper->viewRenderer->setNoRender(true);
		#
	}
	#
	

	#
	public function generatecaptchaAction() #
	{
		#
		

		#
		//Let’s generate a totally random string using md5
		#
		$md5_hash = md5 ( rand ( 0, 999 ) );
		#
		//We don’t need a 32 character long string so we trim it down to 5
		#
		$security_code = substr ( $md5_hash, 15, 5 );
		#
		
		echo $security_code;
		#
		//$_SESSION [captcha_code] = $security_code;
		#
		

		#
		//Set the image width and height
		#
		$width = 100;
		#
		$height = 20;
		#
		

		#
		//Create the image resource
		#
		$image = ImageCreate ( $width, $height );
		#
		

		#
		//We are making three colors, white, black and gray
		#
		$white = ImageColorAllocate ( $image, 255, 255, 255 );
		#
		$black = ImageColorAllocate ( $image, 0, 0, 0 );
		#
		$grey = ImageColorAllocate ( $image, 204, 204, 204 );
		#
		

		#
		//Make the background black
		#
		ImageFill ( $image, 0, 0, $black );
		#
		

		#
		//Add randomly generated string in white to the image
		#
		ImageString ( $image, 3, 30, 3, $security_code, $white );
		#
		

		#
		//Throw in some lines to make it a little bit harder for any bots to break
		#
		ImageRectangle ( $image, 0, 0, $width - 1, $height - 1, $grey );
		#
		imageline ( $image, 0, $height / 2, $width, $height / 2, $grey );
		#
		imageline ( $image, $width / 2, 0, $width / 2, $height, $grey );
		#
		

		#
		//Tell the browser what kind of file is come in
		#
		header ( "Content-Type: image/jpeg" );
		#
		

		#
		//Output the newly created image in jpeg format
		#
		ImageJpeg ( $image );
		#
	}

}