Quellcode

<?php
# KNS V2 | Idee: Onkel Hotte | Umsetzung: Headless (kitnetwork.de)
class pkCaptcha
{
    var $pk_cap_size;
    var $pk_cap_font;
    var $pk_cap_code;
    var $pk_cap_len;
    var $pk_cap_bg;

    #constructor (php4)
    function pkCaptcha()
    {
        $this->__construct() ;
    }
	
    #constructor (php5)
    function __construct()
	{
		$this->pk_cap_code      = "";
		$this->pk_cap_font      = "./nospam/fonts/xfile".rand(1,3).".ttf";
		$this->pk_cap_bg        = "./nospam/bgimg/captBG".rand(1,4).".png";
		$this->pk_cap_size  	= 15;
		$this->pk_cap_len       = 5;
		$this->pk_cap_chardef	= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
	}

	#create captcha
    function showCaptcha()
    {
		header('Content-type: image/png');
	
		$image=ImageCreateFromPNG($this->pk_cap_bg); 
		$color=ImageColorAllocate($image,0,0,0);
		$angle=rand(-4,4); 
		$x=rand(5,35);
		$y=20; 

		imagettftext($image,$this->pk_cap_size,$angle,$x,$y,$color,$this->pk_cap_font,$this->pk_cap_code);
		imagepng($image);
		imagedestroy($image);
    }

	#srand func
	function captchaMtSrand() 
	{
		if(pkPHPVERSION<420)
			srand((double)microtime()*1000000);
	}
	
	#generate new captcha code
    function makeCode()
    {
        //if (!isset($_SESSION['pkCAPTCHACODE'])) {
			$this->captchaMtSrand();
			$string='';
			
			for($i=0; $i<$this->pk_cap_len; $i++)
				$this->pk_cap_code.=substr($this->pk_cap_chardef,mt_rand(0,61),1);
				
            $_SESSION['pkCAPTCHACODE'] = $this->pk_cap_code;
        //} else {
            $this->pk_cap_code = $_SESSION['pkCAPTCHACODE'];
        //}
    }
	
	#clean session array
    function unsetCode()
    {
        if (isset($_SESSION['pkCAPTCHACODE'])) {
            unset($_SESSION['pkCAPTCHACODE']);
        }
    }

	#check captcha code
	function validCode($postCode)
	{
		$sessCode=$_SESSION['pkCAPTCHACODE'];
		$this->unsetCode();
		
		return (!empty($sessCode) && strtolower($sessCode) == strtolower($postCode));
	}
}
?>