Image Verification

[mr_mind]

I was told to post this here.

 

Alright i was searching for captcha a while back and i found one that worked, though after a while it was giving me lots and lots of problems, So i have come up with my own and would like to beta test it on you guys. The hardest part was making a random string generator, because it was so hard i have made it a lot bigger to use it later on in my site. here is the random string script:

 

<?php
function str_rand($string_length, $string_type='numeric') {
	$string_array = array('numeric','alpha','alnum','alnum_cap','alnum_low','alpha_cap','alpha_low');
	if(array_search($string_type, $string_array) !== FALSE) {
		if($string_length < 40) {
			switch($string_type) {
				case 'numeric':
					$string_seed = range('1','9');
				break;
				case 'alpha':
					$string_seed = array_merge(range('A','Z'), range('a','z'));
				break;
				case 'alpha_cap':
					$string_seed = range('A','Z');
				break;
				case 'alpha_low':
					$string_seed = range('a','z');
				break;
				case 'alnum':
					$string_seed = array_merge(range('1','9'), array_merge(range('A','Z'), range('a','z')));
				break;
				case 'alnum_cap':
					$string_seed = array_merge(range('1','9'), range('A','Z'));
				break;
				case 'alnum_low':
					$string_seed = array_merge(range('1','9'), range('a','z'));
				break;
			}
			$string_random = '';
			for($i=0;$i<$string_length;$i++) {
				$string_key = array_rand($string_seed, 1);
				$string_random .= $string_seed[$string_key];
			}
			return $string_random;
		}
		else {
			return 'Invalid string length';
		}
	}
	else {
		return 'Invalid string type';
	}
}
?>

 

Now we have the image generating function

 

<?php
require_once "/var/www/localhost/htdocs/inc/functions.php";
$image_width = 270;
$image_height = 40;
$image_base = imagecreatetruecolor($image_width,$image_height);
$image_background = imagecolorallocate($image_base, 250, 250, 250);
imagefill($image_base, 0, 0, $image_background);
if(isset($_GET['s'])) {
	$image_text = $_GET['s'];
}
else {
	$image_text = str_rand(6, 'alnum');
}
$image_text_array = str_split($image_text, 1);
$image_text_color = imagecolorallocate($image_base,0,0,0);
$image_font = '/var/www/localhost/htdocs/fonts/verdana.ttf';
$image_letter = ($image_width/8);
header('Content-type: image/png');
for($i=0;$i<=16;$i++) {
	$image_line_color = imagecolorallocatealpha($image_base,mt_rand('0','200'),mt_rand('0','200'),mt_rand('0','200'),mt_rand('20','115'));
	imagesetthickness($image_base,mt_rand('1','3'));
	imageline($image_base,mt_rand('0',$image_width),mt_rand('0',$image_height),mt_rand('0',$image_width),mt_rand('0',$image_height),$image_line_color);
}
$image_dots_spacing = 10;
$image_dots_y = $image_height/$image_dots_spacing;
for($i=0;$i<=$image_dots_y;$i++) {
	$image_line_color = imagecolorallocatealpha($image_base,mt_rand('0','200'),mt_rand('0','200'),mt_rand('0','200'),mt_rand('20','115'));
	imagesetthickness($image_base,2);
}
for($i=0;$i<=6;$i++) {
	$image_text_direction = mt_rand('1','2');
	if($image_text_direction == 1) {
		imagettftext($image_base, 20,-mt_rand('5','15'),$image_letter,30,$image_text_color,$image_font,$image_text_array[$i]);
	}
	else {
		imagettftext($image_base, 20,mt_rand('5','15'),$image_letter,30,$image_text_color,$image_font,$image_text_array[$i]);
	}
	$image_letter = $image_letter+($image_width/8);
}
imagepng($image_base);
imagedestroy($image_base);
?>

 

Then we have the verification that the image is correct

 

 

<?php
function captcha_check($response, $captcha) {
	$captch_check = @substr_compare($captcha, $response, 0, strlen($captcha), TRUE);
	if($captch_check == 0) {
		return '1';
	}
	else {
		return '2';
	}
}
?>

 

There you go, tell me your opinions.

[ober]

Who told you to post it on this board?  Critiques are for looks and functionality, not reviewing code.  I'd move the thread now but I want to know who told you to put it here first to make sure I'm not stepping on another mod/admin.

[mr_mind]

http://www.phpfreaks.com/forums/index.php?action=profile;u=48068

[ober]

ok then... moving.

[Coreye]

"If you want us to rate the script then you should post it on the critique forum." is what I said.

 

You were not looking for help on the actual script and were looking for someone to to test your code. The beta test board is the correct board for that, I just didn't know what you were wanting because all you did was show the code.