mirror of
https://github.com/janickiy/yii2-nomer
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59 lines
1.9 KiB
PHP
59 lines
1.9 KiB
PHP
<?php
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/* evercookie, by samy kamkar, 09/20/2010
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* http://samy.pl : code@samy.pl
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*
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* This is the server-side variable PNG generator for evercookie.
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* If an HTTP cookie is passed, the cookie data gets converted into
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* RGB-values in a PNG image. The PNG image is printed out with a
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* 20-year cache expiration date.
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*
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* If for any reason this file is accessed again WITHOUT the cookie,
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* as in the user deleted their cookie, the code returns back with
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* a forced 'Not Modified' meaning the browser should look at its
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* cache for the image.
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*
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* The client-side code then places the cached image in a canvas and
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* reads it in pixel by pixel, converting the PNG back into a cookie.
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*
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* -samy kamkar
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*/
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// we get cookie name from current file name so remember about it when rename of this file will be required
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include dirname(__FILE__) . DIRECTORY_SEPARATOR . '_cookie_name.php';
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$cookie_name = evercookie_get_cookie_name(__FILE__);
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// we don't have a cookie, user probably deleted it, force cache
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if (empty($_COOKIE[$cookie_name])) {
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if(!headers_sent()) {
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header('HTTP/1.1 304 Not Modified');
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}
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exit;
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}
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// width of 200 means 600 bytes (3 RGB bytes per pixel)
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$x = 200;
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$y = 1;
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$gd = imagecreatetruecolor($x, $y);
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$data_arr = str_split($_COOKIE[$cookie_name]);
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$x = 0;
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$y = 0;
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for ($i = 0, $i_count = count($data_arr); $i < $i_count; $i += 3) {
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$red = isset($data_arr[$i]) ? ord($data_arr[$i]) : 0;
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$green = isset($data_arr[$i+1]) ? ord($data_arr[$i+1]) : 0;
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$blue = isset($data_arr[$i+2]) ? ord($data_arr[$i+2]) : 0;
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$color = imagecolorallocate($gd, $red, $green, $blue);
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imagesetpixel($gd, $x++, $y, $color);
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}
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if(!headers_sent()) {
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header('Content-Type: image/png');
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header('Last-Modified: Wed, 30 Jun 2010 21:36:48 GMT');
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header('Expires: Tue, 31 Dec 2030 23:30:45 GMT');
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header('Cache-Control: private, max-age=630720000');
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}
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// boom. headshot.
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imagepng($gd);
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