[PHP]captcha Opcje

[b4rt3kk]

Witam, napisałem sobie system captcha, oto klasa:

[PHP] pobierz, plaintext 
class captcha{
 
	public $width;
	public $height;
	public $characters;
	public $lines;
 
	function __construct($width, $height, $characters, $lines){
		$this -> width = $width;
		$this -> height = $height;
		$this -> characters = $characters;
		$this -> lines = $lines;
	}
 
	function drawCaptcha(){
 
		// set up margin as 10% of image height
 
		$margin = ceil($this -> height * 0.1);
 
		// randomize background RGB color
 
		$backgroundR = mt_rand(100,150);
		$backgroundG = mt_rand(100,150);
		$backgroundB = mt_rand(100,150);
 
		// font color
 
		$fontR = mt_rand(0,20);
		$fontG = mt_rand(0,20);
		$fontB = mt_rand(0,20);
 
		// lines color
 
		$linesR = mt_rand(200,255);
		$linesG = mt_rand(200,255);
		$linesB = mt_rand(200,255);
 
		// create image
 
		$image = imagecreatetruecolor($this -> width, $this -> height);
 
		// colors
 
		$backgroundColor = imagecolorallocate($image, $backgroundR, $backgroundG, $backgroundB);
		$fontColor = imagecolorallocate($image, $fontR, $fontG, $fontB);
		$linesColor = imagecolorallocate($image, $linesR, $linesG, $linesB);
		imagefill($image, 0, 0, $backgroundColor);
 
		// draw lines on background
 
		for ($i=0; $i<$this -> lines; $i++) {
			imageline($image, rand(0, $this -> width), 0, rand(0, $this -> width), $this -> height, $linesColor);
			imageline($image, 0, rand(0, $this -> height), $this -> width, rand(0, $this -> height), $linesColor);
		}
 
		$font = '../font/Delicious-Roman.otf';
		$charTable = '0123456789abcdefghijklmnoprstuwyzABCDEFGHIJKLMNOPRSTUWYZ';
 
		// code generation
 
		$character = array();
		$angle = array();
 
		for ($i=1; $i<=$this -> characters; $i++) {
			$character[] = $charTable[mt_rand(0, strlen($charTable)-1)];
			$angle[] = mt_rand(-20,20);
		}
 
		$captchaCode = implode($character);
		$_SESSION['captchaCode'] = $captchaCode;
 
		// count max font size
 
		$fontSizeMax = floor($this -> height - $margin * 2);
 
		do {
 
			$fontSizeMax--;
			$captchaWidth = 0;
			$charHeight = array();
 
			for ($i=0; $i<sizeof($character); $i++) {
 
				$bbox = imageftbbox($fontSizeMax, $angle[$i], $font, $character[$i]);
				$captchaWidth += $charWidth = max(abs($bbox[0])+abs($bbox[2]), abs($bbox[4])+abs($bbox[6]))+$margin;
				$charHeight[] = max(abs($bbox[1])+abs($bbox[3]), abs($bbox[5])+abs($bbox[7]));
 
			}
 
			} while (max($charHeight) >= $this -> height OR $captchaWidth >= $this -> width - 2*$margin);
 
		// draw text to image
 
		$x = ($this -> width - $captchaWidth) / 2;
		$fontSpacing=$margin;
 
		for ($i=0; $i<sizeof($character); $i++) {
 
			$bbox = imageftbbox($fontSizeMax, $angle[$i], $font, $character[$i]);
			$charWidth = max(abs($bbox[0])+abs($bbox[2]), abs($bbox[4])+abs($bbox[6]))+$margin;
			imagettftext($image, $fontSizeMax, $angle[$i], $x+$fontSpacing, $this -> height/2+$margin, $fontColor, $font, $character[$i]);
			$fontSpacing += $charWidth;
 
		}
 
		Header('Content-type: image/png');
		imagepng($image);
 
	}
 
}
[PHP] pobierz, plaintext 

Plik index wygląda tak:

[PHP] pobierz, plaintext 
session_start();
 
echo '<img src="img/captcha.php"/>';
echo $_SESSION['captchaCode'];
[PHP] pobierz, plaintext 

oraz plik obrazka:

[PHP] pobierz, plaintext 
session_start();
 
function __autoload($class){
	require_once('../class/'.$class.'.class.php');
}
 
$captcha = new captcha(150, 50, 6, 10);
$captcha -> drawCaptcha();
[PHP] pobierz, plaintext 

No i po wyświetleniu pliku index.php generuje mi elegancko obrazek, natomiast $_SESSION['captchaCode'] na początku zwraca notice, że zmienna jest pusta, a po odświeżeniu jest nowo wygenerowany obrazek a $_SESSION zawiera kod poprzedniego, jak to przekazać, nie musi być w sesji, bym miał jednocześnie kod w postaci stringa i obrazek z tym samym kodem...

Ten post edytował b4rt3kk 17.07.2012, 00:50:19