Cookies and Session - in Detail

How to set cookies?

setcookie('variable','value','time');

variable - Name of the cookie variable
value - Value of the cookie variable
time - Expiry time;
Example: setcookie('Test',$i,time()+3600);

Test - cookie variable name
$i - value of the variable 'Test'
time()+3600 - Cookie will expire after one hour.

How to reset/destroy a cookie?

Reset a cookie by specifying expire time in the past:
Example: setcookie('Test',$i,time()-3600); // already expired time

Reset a cookie by specifying its name only
Example: setcookie('Test');

Default session time in php?

The default session time in php is until closing of browser.

How to get the value of current session id?

session_id() returns the session id for the current session.