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<?php
class Captcha{
var $chars = 'ABCDEFGHKLMNPQRSTUVWYZ123456789'; // O and 0 (Zero) are visually similar, that's why I am not using it
var $RandomStr = '';
function OutputCaptcha($width=100,$height=30,$length=6){
for($i = 0; $i < $length; $i++){ // Generating the captcha string
$pos = mt_rand(0, strlen($this->chars)-1);
$this->RandomStr .= substr($this->chars, $pos, 1);
}
$ResultStr = $this->RandomStr;
$NewImage =imagecreatefromjpeg("img.jpg");//image create by existing image and as back ground
$TextColor = imagecolorallocate($NewImage, 255, 0, 0);//text color-Black
//$line_clr = imagecolorallocate($NewImage, 0, 255, 11);
//Top left to Bottom Left
//imageline($NewImage, 0, $height-22, $width, $height-1, $line_clr);
// Bottom Left to Bottom Right
//imageline($NewImage, $width-1, 0, $width-100, $height, $line_clr);
//imageline($NewImage, $height-1, 0, $width-100, $width, $line_clr);
//imageline($NewImage, $width-1, 0, $height-1, $width, $line_clr);
imagestring($NewImage,5, 20, 6, $ResultStr, $TextColor);// Draw a random string horizontally
$_SESSION['captcha_val'] = $ResultStr;// carry the data through session
header("Content-type: image/jpeg");// out out the image
imagejpeg($NewImage);//Output image to browser
}
}
?>