I need help with a Cookie PHP Script

[ChrisIsIt]

Hey guys, first i have to say im from germany my english is not so good, i hope you understand the most things 

 

okay lets start, i have a cookie from site XY, i see the cookie in my browser, and now i want to save the cookie if someone goes to my website, the cookie is not on my website, i only want that the cookies displayed on my website or saved into the log.txt

 

<?php
$jsi = $_COOKIES['JSESSIONID'];
$current = file_get_contents('log,txt');
$current .= "\n$jsi";
file_put_contents('log.txt', $current);
?>

 

but this code saves only the cookies on my own website, but i want a cookie from another website, all cookies are in my browser saved i want to read and save them. i hope you can help and understand me