php - fetch data based on another table -

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i have table users , table zebra friend list. want t fetch details of friends connected particular user

here code using. not working. 

     $user_friend_pro_query= "select * users user_id    in    (select zebra_id zebra user_id='$uid');";     $user_friend_pro_fetch = $conn->query($user_friend_pro_query);       while($friend_pro_rows = $user_friend_pro_fetch->fetch_assoc())    {    $friend_id=$friend_pro_rows['user_id'];    $user_avatar_thumb=$friend_pro_rows['user_avatar_thumb'];    ?><li> <a href="memeber-profile.php?user_id=<?php echo $friend_id ?>">    <img src="<?php echo $user_avatar_thumb ; ?>"   width="42" height="42"></a></li>

please help

can try change code segment 

(select zebra_id zebra user_id='$uid');";

to

(select zebra_id zebra user_id='".$uid."')";

this escape $uid variable, might cause problem.


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