How do you get the same cookie value for different pages that are not associated with a website?

For example, a Web site has a few unrelated pages in the same directory: 1.php,2.php,3.php
A user generates a cookie after accessing 1.php:

Setcookie (' Mycookie1 ', $c 1);
Setcookie (' Mycookie2 ', $c 2);
Setcookie (' Mycookie3 ', $c 3);

If this user clicks the hyperlink from another website into 2.php, the result cannot read the cookie value of 1.php setting in 2.php.
If I do a hyperlink in the 1.php to 3.php, from the 1.php point hyperlink Access 3.php, on the 3.php will be able to display my 1.php set the cookie value:
The code for both 2.php and 3.php is the same:

$CC 1 = $_cookie[' mycookie1 ');
$CC 2 = $_cookie[' mycookie2 ');
$CC 3 = $_cookie[' mycookie3 ');
echo $CC 1;
echo $CC 2;
echo $CC 3;

How can I read the cookie value of 1.php settings in a 3.php page that is fully associated with 1.php?

Reply to discussion (solution)

Set the expiration period of a cookie variable

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