The key to read the cookie in PHP is worth other information

The key in PHP that reads a cookie is worth other information
I want to add a function to change the password
Set cookies
Setcookie (' UserId ', $dataUser->rowid,0, '/');
Setcookie (' UserName ', $dataUser->username,0, '/');
Setcookie (' usertype ', $dataUser->usertype,0, '/');
Setcookie (' Corpcode ', $dataUser->corpcode,0, '/');
Then how to read the value of the ID, get the password, compared with the original password ....
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$_cookie[' UserId '];

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It looks like there's no mistake, but you have to go through your own tests to know.
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Setcookie (' UserId', $dataUser->rowid,0, '/');
$dataUser->passwd= $dataUser->find (Array (' passwd ' =? ', $_cookie [" UserID"]);
The keys of an array are case-sensitive

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