How to pass variables

Question

<a href="/index.php?a=user2 & modify= " ><?php echo $bbs_v['user_id']; ?></a>

Please give me some advice: How to pass the variable <?php echo $bbs_v['user_id']; ?> to the index.php file.

Answer 1

Assemble <?php echo $bbs_v['user_id']; ?> as a string into the get request