captcha

<?php
session_start();//projekt 2
header("Content-type: image/jpeg");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");


$skrifttyper[] = 'OpenSans-Regular.ttf';//"Arial.ttf";
$skrifttyper[] = 'Oswald-Regular.ttf';//"Tahoma.ttf";
$skrifttyper[] = 'Raleway-Regular.ttf';//"Impact.ttf";
$skrifttyper[] = 'Ubuntu-Medium.ttf';//"Verdana.ttf";
$skrifttyper[] = 'Dosis-Medium.ttf';//"Georgia.ttf";


$width=250;
$height=60;

$image = imagecreatetruecolor($width,$height);//Danner billedet

$y=0;$x=0;
for($i=0;$i<($width*$height);$i++)
{   $color = imagecolorallocate($image, mt_rand(155, 255), mt_rand(155, 255), mt_rand(155, 255));
    imagesetpixel($image, ($x - 1), $y, $color);
    $x += 1;
    if($x >= $width)
    {   $y += 1;
        $x = 1;
    }
}
//----------------laver security-kode til brug i ny-bruger.php---------------
$input='';
$tegn = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz";
for($i=0;$i<6;$i++)
{   $input.=substr($tegn, mt_rand(0, (strlen($tegn) - 1)), 1);
}
//-----------------indsætter security-kode i SESSION som bruges i opret-bruger.php-----------------
$_SESSION['security_code'] = $input;
$x = mt_rand(5, 35);//Startpunkt 10,$height
$y = mt_rand(35, 50);//Startpunkt 35,50

for($i=0;$i<strlen($input);$i++)
{   $color = imagecolorallocate($image, mt_rand(0, 155), mt_rand(0, 155), mt_rand(0, 155));
    $font = "font/".$skrifttyper[mt_rand(0, (count($skrifttyper) - 1))];
    //$font = "C:/Windows/Fonts/".$skrifttyper[mt_rand(0, (count($skrifttyper) - 1))];
    imagettftext($image, mt_rand(25, 30), mt_rand(-10, 10), $x, $y, $color, $font, substr($input, $i, 1));
    $x += mt_rand(25, 40);
    $y += mt_rand(-5, 5);
}

for($i=0;$i<mt_rand(4, 6);$i++)
{   $color = imagecolorallocate($image, mt_rand(0, $width), mt_rand(0, $width), mt_rand(0, $width));
    if(mt_rand(0, 2) == 1)
    {   imageellipse($image, mt_rand(50,150), mt_rand(10, 50), mt_rand(10, $height), mt_rand(10, $height),$color);
    }
    else
    {   imageline($image, mt_rand(0, 50), mt_rand(0, $height), mt_rand(100, $width), mt_rand(0, $height), $color);
    }
}
for($i=0;$i<mt_rand(250, 500);$i++)
{   $color = imagecolorallocate($image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
    imagesetpixel($image, mt_rand(0, $width), mt_rand(0, $height), $color);
}

imagejpeg($image);
ImageDestroy($image);

?>