How to Retrieve a Cookie Value?

The PHP $_COOKIE variable is used to retrieve a cookie value.

In the example below, we retrieve the value of the cookie named "user" and display it on a page:
< ?php
// Print a cookie
echo $_COOKIE["user"];

// A way to view all cookies
print_r($_COOKIE);
? >
In the following example we use the isset() function to find out if a cookie has been set:
< html >
< body >

< ?php
if (isset($_COOKIE["user"]))
echo "Welcome " . $_COOKIE["user"] . "!< br / >";
else
echo "Welcome guest!< br / >";
? >

< /body >
< /html >