Add and Remove Friend Button - php

Question

I am with some difficulties on create an Add Friend and Remove Friend button.
For example if the 'accepted' row in mysql of table friends_request is equals to 1 then it should appears the 'Remove Friend' button, otherwise it should appears the 'Add Friend' button.
Here is the code of the buttons I did, which is wrong.
<?php
$selfriendsBtn = "SELECT fr.username
FROM (select from_username AS username
FROM friends_request
WHERE to_username = '".$_GET['u']."' AND accepted = 1
UNION ALL
SELECT to_username AS username
FROM friends_request
WHERE from_username = '".$_GET['u']."' AND accepted = 1) AS fr
JOIN users AS u ON u.username = fr.username LIMIT 5";
$resultfriend_add_rmv = $sql->query($selfriendsBtn);
$rowAdd_RmvFriend = mysqli_fetch_assoc($resultfriend_add_rmv);
$accepted = $rowAdd_RmvFriend['accepted'];
if($user != $_GET['u']) {
if($accepted == 1) {
?>
<table>
<tr>
<td>
<form action="profile.php?u=<?php echo $_GET['u']; ?>&deleted=<?php echo $user; ?>" method="POST">
<input type="submit" name="rmvfriend" value="Remove Friend" />
</form>
</td>
<td>
<form action="profile.php?u=<?php echo $_GET['u']; ?>&a=compose" method="POST">
<input type="submit" name="msg" value="Message" />
</form>
</td>
</tr>
</table>
<?php
} else {
?>
<table>
<tr>
<td>
<form action="profile.php?u=<?php echo $_GET['u']; ?>&requested=<?php echo $user; ?>" method="POST">
<input type="submit" name="addfriend" value="Add Friend" />
</form>
</td>
<td>
<form action="profile.php?u=<?php echo $_GET['u']; ?>&a=compose" method="POST">
<input type="submit" name="msg" value="Message" />
</form>
</td>
</tr>
</table>
<?php
}
}
?>
The SELECT tables I pick up from the friends.php page and implemented it on here.
I don't know why it's not working. Should I use loop or not? Well, in my opinion I think a loop it would work very well on this.

Answer 1

You're looking for a value that isn't present in the result set:
$accepted = $rowAdd_RmvFriend['accepted'];
The only value you select from the database is the username:
SELECT fr.username
FROM ...
So $accepted will never be equal to 1. Thus, this will always be false:
if ($accepted == 1)
So the else block (the "Add Friend" button) will always be shown.
You should also select the accepted value from your query so you can use it in your logic. This is mostly a guess based on your query so far, but it looks like you'd need to add it in three places:
SELECT fr.username, fr.accepted -- here
FROM (select from_username AS username, accepted -- here
FROM friends_request
WHERE to_username = ? AND accepted = 1
UNION ALL
SELECT to_username AS username, accepted -- here
FROM friends_request
...
Keep in mind that nobody here really knows your data, so you may need to tinker with the query a little bit in your database management tools to get it just right.