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index.php
| <?php
session_start();
///->
if(isset($_POST['submit'])){
$captcha = $_POST['captcha'];
$captcha = strtoupper($captcha); // force to upper cuz captcha characters are uppers and it have to be too, else, the user will have to capitalize it by himself
if(md5($captcha) == md5($_SESSION['CaptchaCode'])){
$_SESSION['CaptchaCode'] = NULL; // destroy previous captcha code, so, if the user reload, he'll get the error
echo 'Congratulations, Captcha code Passed';
}else{
echo 'Error, check the verification code please';
}
}
?>
<?=$_SESSION['CaptchaCode'];?>
<form action="<?=$_SERVER['PHP_SELF'];?>" method="post">
Verification Image:
<input type="text" name="captcha" />
<img src="captcha.php" alt="0" />
<input type="submit" name="submit" />
</form> | |
captcha.php
| <?
session_start();
///->
class Captcha{
var $Image, $CNum, $Width, $Height, $Spacer, $Fonts, $Code, $TTF;
var $FDir = 'fonts/'; // Directory for fonts
var $Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; // Allowed Characters
var $captcha_bg = 'captcha_bg.jpg'; // Captcha Background Image
var $AngleMin = -20; // min grades letter will be rotated
var $AngleMax = 20; // max grades letter will be rotated
///->
function Captcha($w = 180, $h = 50, $cn = 7){
$this->Image = imagecreatefromjpeg($this->captcha_bg);
$this->Width = $w;
$this->Height = $h;
$this->CNum = $cn;
$this->Fonts = array('Adler.ttf', 'Adonais.ttf', 'Alba.ttf', 'Baveuse.ttf', 'Heck.ttf');
//->
$this->Get_Space();
$this->GenerateCode();
}
///->
function Get_Space(){ $this->Spacer = (int)($this->Width/$this->CNum); }
///->
function GenerateCode(){
mt_srand(microtime() * 1000000);
$this->Code = '';
//->
for($i = 0; $i < $this->CNum; $i++){
$key = mt_rand(0, strlen($this->Chars)-1);
$this->Code = $this->Code . $this->Chars{$key};
}
for($i = 0; $i < $this->CNum; $i++){
$key_1 = mt_rand(0, strlen($this->Code)-1);
$key_2 = mt_rand(0, strlen($this->Code)-1);
$tmp = $this->Code{$key_1};
$this->Code{$key_1} = $this->Code{$key_2};
$this->Code{$key_2} = $tmp;
}
//->
$this->Code = htmlentities($this->Code, ENT_QUOTES);
}
///->
function drawLines(){
for($i = 0; $i < $this->LNum; $i++){
$Colour = rand(100, 250);
$colour = imagecolorallocate($this->Image, $Colour, $Colour, $Colour);
//->
$W = $this->Width; $H = $this->Height;
imageline($this->Image, rand(0, $this->Width), rand(0, $this->Height), rand(0, $this->Width), rand(0, $this->Height), $colour);
}
}
function drawCode(){
for($i = 0; $i < $this->CNum; $i++){
$r1 = rand(90, 120); $r2 = rand(100, 130); $r3 = rand(110, 140);
$Letter = substr($this->Code, $i, 1);
$fcolor = imagecolorallocate($this->Image, $r1, $r2, $r3);
$font = $this->FDir.$this->Fonts[rand(0, count($this->Fonts)-1)];
$fsize = rand(24, 36);
if($i > 0 && $i < $this->CNum-1){ $Angle = rand($this->AngleMin, $this->AngleMax); }else{ $Angle = 0; }
//->
$TB = imagettfbbox($fsize, $Angle, $font, $Letter);
$X = $this->Spacer / 5 + $i * $this->Spacer;
$iCharHeight = $TB[2] - $TB[5];
$Y = $this->Height / 2 + $iCharHeight / 4;
imagettftext($this->Image, $fsize, $Angle, $X, $Y, $fcolor, $font, $Letter);
}
}
function Draw(){
$this->drawCode();
//->
$_SESSION['CaptchaCode'] = $this->Code;
//->
header("Expires: 0");
if(function_exists('imagegif')){
header("Content-type: image/gif");
header('Cache-control: no-cache, no-store');
imagegif($this->Image);
}elseif(function_exists('imagejpeg')){
header("Content-type: image/jpeg");
header('Cache-control: no-cache, no-store');
imagejpeg($this->Image, null, 100);
}else{
header("Content-type: image/png");
header('Cache-control: no-cache, no-store');
imagepng($this->Image);
}
imagedestroy($this->Image);
exit;
}
}
$captcha = new Captcha;
$captcha->Draw();
?> | |
|
|
| A damaged image generator (class) for validating text.
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