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How Are Cookies Encoded During Transportation
How Are Cookies Encoded During Transportation? - PHP Script Tips - Understanding and Managing Cookies
✍: FYIcenter.com
When cookies are transported from servers to browsers and from browsers back to servers, Cookies values are always encoded using the URL encoding standard to ensure that they are transported accurately. But you don't need to worry about the encoding and decoding processes yourself. PHP engine will automatically encode cookies created by setcookie(), and decode cookies in the $_COOKIE array. The tutorial exercise will help you understand this concept better.
Write a sample PHP script, encoding_cookies.php, like this:
<?php setcookie("Letters", "FYICenter"); setcookie("Symbols", "A~!@#%^&*(), -_=+[]{};:'\"/?<>."); setcookie("Latin1", "\xE6\xE7\xE8\xE9\xA5\xA9\xF7\xFC"); print("<pre>\n"); $count = count($_COOKIE); print("$count cookies received.\n"); foreach ($_COOKIE as $name => $value) { print " $name = $value\n"; } print("</pre>\n"); ?>
First, run this script off-line in a command window:
>php-cgi encoding_cookies.php Content-type: text/html X-Powered-By: PHP/5.0.4 Set-Cookie: Letters=FYICenter Set-Cookie: Symbols=A%7E%21%40%23%25%5E%26%2A%28%29%2C +-_%3D%2B%5B%5D%7B%7D%3B%3A%27%22%2F%3F%3C%3E. Set-Cookie: Latin1=%E6%E7%E8%E9%A5%A9%F7%FC <pre> 0 cookies received. </pre>
You see how cookie values are encoded now. Then copy the script, encoding_cookies.php to the Web server, and run it with a browser. You will get:
3 cookies received. Letters = FYICenter Symbols = A~!@#%^&*(), -_=+[]{};:\'\"/?.<> Latin1 = ??????
This shows that the values in the $_COOKIE array are already decoded.
2007-04-24, 4784👍, 0💬
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