PHP mechanisms for addressing cookies are to do with handling HTTP headers.
See separate "DOCheaders" for general basics; this file for cookies
specifically.
========================

Very basically: cookies are varname-value pairs, sent by servers to client
browsers, and sent back by the browsers to give session state.

Basically each cookie has not 2 but 4 attributes:
Varname
Value
Expiry time.  (Unix time in seconds.  If 1 it means expire whenn browser quits)
Server+file-dir it was sent from/by

========================
I need to get cookies working, not least for login to moodle within PHP.

When developed, will be in myfilegetcontents()
Test case bed is prCERE.php

$_COOKIE is a super global.  $_COOKIE['name']
	htmlspecialchars($_COOKIE["name"])
setcookie(), getcookie(), setrawcookie() 
	[normally auto encode, decode: so vars hold the unencoded version.]


setcookie(<name>, <value>, expiretimestamp e.g. time() + 3600, <path>e.g. '/',
		<domain>e.g. '.fims.moodle.gla.ac.uk');
		0 for timestamp means at end of browser session
setcookie("TestCookie", $value);
setcookie("TestCookie", $value, time()+3600);  /* expire in 1 hour */
setcookie("TestCookie", $value, time()+3600, "/~rasmus/", ".example.com", 1);

http://uk3.php.net/manual/en/function.setcookie.php


Next strategy?:  
Try printing a cookie
Do getcookie, resend cookie (and add username='guest'). password=guest
testcookies=1  or try without this.

Or see if simply having a sesskey cookie and ignoring the rest will work.

MORE NOTES: java cookies
You can set a cookie in java.  Could this be useful?
(It's proposed on web as part of a sol. for getting PHP to see Anchor tags in
URL.)
Main use may be in dealing from me as server with clients: if the page I send
them creates cookies from their input values, then I don't have to send them a
2nd page.

<SCRIPT> document.cookies = 'varname=val'; </SCRIPT>
This sets it, and refresh of the page gets it to the server/PHP.

Have to explore:
1.  Does this overwrite other cookies for same server/page?
	No.  it looks like a single string var; but actually it accumulates
	cookies.
2.  How to control duration of cookie (session only, etc.)
	Yes; see examples; duration = 0 means when browser closes.
3.  ?Can set cookies for other servers?
	No.  But maybe try doing a re-location but staying in the java script
	and setting cookies in that?  If doing re-loc doesn't terminate the
	java.

document.cookie =
  'ppkcookie2=another test; expires=Fri, 3 Aug 2001 20:47:11 UTC; path=/'

http://www.quirksmode.org/js/cookies.html
http://www.w3schools.com/js/js_cookies.asp
http://en.wikipedia.org/wiki/HTTP_cookie