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secureimage.php

Go to the documentation of this file.

<?php
// Debug:
$text = "alphabet";
$hidelevel = 5;

function GetColor(&$img)
//{{{
{
        return imagecolorallocate($img, rand(0,255), rand(0,255), rand(0,255));
}
//}}}
function MakeImage($letter)
//{{{
{
        $img = @imagecreatetruecolor(50,50);
        imagefill($img, 0, 0, GetColor($img));
        imagettftext($img, 18, rand(-60,60), 20, 25, GetColor($img),
                './VeraSeBd.ttf', $letter);
        return $img;
}
//}}}
function HideImage(&$img, $hidelevel)
//{{{
{
        $maxX = imagesx($img);
        $maxY = imagesy($img);
        for($i = 1; $i <= $hidelevel; $i++)
        {
                $function = rand(1,5);
                switch ($function)
                {
                        case 1:
                                imagerectangle( $img,
                                        rand(0, $maxX), rand(0, $maxY),
                                        rand(0, $maxX), rand(0, $maxY),
                                        GetColor($img));
                                break;
                        case 2:
                                imagearc( $img,
                                        rand(0, $maxX), rand(0, $maxY),
                                        rand(0, $maxX), rand(0, $maxY),
                                        rand(0, 359), rand(0, 359),
                                        GetColor($img));
                                break;
                        case 3:
                                imageline( $img,
                                        rand(0, $maxX), rand(0, $maxY),
                                        rand(0, $maxX), rand(0, $maxY),
                                        GetColor($img));
                                break;
                        case 4:
                                imagedashedline( $img,
                                        rand(0, $maxX), rand(0, $maxY),
                                        rand(0, $maxX), rand(0, $maxY),
                                        GetColor($img));
                                break;
                        case 5:
                                imageellipse( $img,
                                        rand(0, $maxX), rand(0, $maxY),
                                        rand(0, $maxX), rand(0, $maxY),
                                        GetColor($img));
                                break;
                }
        }
}
//}}}

header('Content-type: image/png');
$outimg = imagecreatetruecolor(50 * strlen($text), 50);
for ($i = 1; $i <= strlen($text); $i++)
//{{{ Make each image, copy it to output image
{
        $img = MakeImage(substr($text, $i - 1, 1));
        HideImage($img, $hidelevel);
        imagecopy( $outimg, $img, 50 * ($i - 1), 0, 0, 0, 50, 50);
        imagedestroy($img);
}
//}}}

imagerectangle($outimg,
        0, 0, imagesx($outimg) - 1, imagesy($outimg) - 1,
        GetColor($outimg));

imagepng($outimg);
imagedestroy($outimg);
?>

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