type='g'; else $this->type='t'; $this->type='g'; } function create_captcha() { $this->hash = md5(time().rand(0, 10000)); $captchastring=''; if($this->type=='g') { $imgziel = imagecreatetruecolor(($this->length*15), 15); $bgcolor = ImageColorAllocate($imgziel, 255, 255, 255); $fontcolor = imagecolorallocate($imgziel, 0, 0, 0); $xziel = imagesx($imgziel); //Ermittlung der Bildbreite $yziel = imagesy($imgziel); //Ermittlung der Bildhöhe ImageFilledRectangle($imgziel, 0, 0, $xziel, $yziel, $bgcolor); for($i=0;$i<$this->length;$i++) { $int=rand(0,9); $captchastring.=$int; imagestring($imgziel, rand(2,5), $i*15, 0, $int, $fontcolor); } for($i=0;$i<$this->noise;$i++) { imagesetpixel($imgziel, rand(0,$xziel), rand(0,$yziel), $fontcolor); } imageJPEG($imgziel, 'tmp/'.$this->hash.'.jpg'); $captcha = ''; } elseif($this->type=='t') { for($i=0;$i<$this->length;$i++) { $captcha .= rand(0,9); } $captchastring=$captcha; } safe_query("INSERT INTO `".PREFIX."captcha` (`hash`, `captcha`, `deltime`) VALUES ('".$this->hash."', '".$captchastring."', '".(time()+(5*60))."');"); return $captcha; } function get_hash() { return $this->hash; } function check_captcha($input,$hash) { if(mysql_num_rows(safe_query("SELECT hash FROM `".PREFIX."captcha` WHERE captcha='".$input."' AND hash='".$hash."'"))) { safe_query("DELETE FROM `".PREFIX."captcha` WHERE captcha='".$input."' AND hash='".$hash."'"); $file='tmp/'.$hash.'.jpg'; if(file_exists($file)) @unlink($file); return true; } else return false; } function clear_oldcaptcha() { $ergebnis=safe_query("SELECT hash FROM `".PREFIX."captcha` WHERE deltime<".time()); while($ds=mysql_fetch_array($ergebnis)) { $file='tmp/'.$ds['hash'].'.jpg'; if(file_exists($file)) @unlink($file); } safe_query("DELETE FROM `".PREFIX."captcha` WHERE deltime<".time()); } } ?>