php - Can't set url value for $_GET when linking to another page via <a> tag -

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i have login page starts session, sets email , session_id value in loggedin database table. when login successful, goes 

dashboard.php?sesid="session_id"

now when on dashboard page, set $userid session id url value.

i have link: 

<a href="?sesid=".$userid."">dashboard</a>

but when click on it, url says 

dashboard.php?sesid=

why id not popping up?

your link should this:

<a href="?sesid='<?php echo $userid; ?>'>dashboard</a>

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