<?
session_start();
header('Content-type: image/png');
header('Cache-Control: no-cache, must-revalidate');
header('Pragma: no-cache'); 
$fonts[] = 'arial.ttf';
$fonts[] = 'tahoma.ttf';
$fonts[] = 'impact.ttf';
$fonts[] = 'verdana.ttf';
$fonts[] = 'georgia.ttf';

$imgwidth = 160;
$imgheight = 50;

$im = imagecreatetruecolor($imgwidth, $imgheight);

$j = $imgwidth * $imgheight;
for($i = 0; $i < $j; $i++) {
    $color = imagecolorallocate($im, mt_rand(155, 255), mt_rand(155, 255), mt_rand(155, 255));
    imagesetpixel($im, ($x - 1), $y, $color);
    $x += 1;
    if($x > $imgwidth) {
        $y += 1;
        $x = 1;
    }
}

$chr = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
for($i = 0; $i < 4; $i++) {
    $input .= substr($chr, mt_rand(0, (strlen($chr) - 1)), 1);
}
$x = mt_rand(10, 15);
$y = mt_rand(35, $imgheight - 20);
$j = strlen($input);
$_SESSION['securitycode'] = $input;
for($i = 0; $i < $j; $i++) {
    $color = imagecolorallocate($im, mt_rand(0, 155), mt_rand(0, 155), mt_rand(0, 155)); 
	putenv('GDFONTPATH=' . realpath('.'));
    $font = "includes/fonts/".$fonts[mt_rand(0, (count($fonts) - 1))];
    imagettftext($im, mt_rand(20, 25), mt_rand(-10, 10), $x, $y, $color, $font, substr($input, $i, 1));
    $x += mt_rand(25, 40);
    $y += mt_rand(-5, 5);
}

$j = mt_rand(4, 6);
for($i = 0; $i < $j; $i++) {
    $color = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 200), mt_rand(0, 200));
    if(mt_rand(0, 2) == 1) {
        imageellipse($im, mt_rand(50, 150), mt_rand(10, 50), mt_rand(10, 60), mt_rand(10, 60), $color);
    } else {
        imageline($im, mt_rand(0, 50), mt_rand(0, 60), mt_rand(100, $imgwidth), mt_rand(0, 60), $color);
    }
}

/*$j = mt_rand(($imgwidth * 60 / 10), ($imgwidth * 60 / 5));
for($i = 0; $i < $j; $i++) {
    $color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
    imagesetpixel($im, mt_rand(0, $imgwidth), mt_rand(0, $imgheight), $color);
}*/
imagepng($im);
?>