php - How can I limit each user to just one like per page? -


i have liking system, bit facebook have. however, users can pages many times possible.. how can limit 1 each user per page? code have is:

<?php     session_start() ;     $conn = mysqli_connect("","","","");     $p_id = $_get['post_id'];     $result = mysqli_query($conn, "select * forum post_id = $p_id");     $row = mysqli_fetch_assoc($result);     mysqli_query($conn, "update forum set likes=likes+1 post_id = '$p_id'") ;     ?>     <?php     header("location: forum.php?id=".$row['post_id']);     die();     ?>

you have track user. make table userid , postid


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