hide button after saving data to database - php

Question

i created a group and what i wanted to do is when i join the group the join button should hide. but i dont know how to do it.. tbl_group is the list of created group and when you join the group the id will be saved on a diff table.. this code is for showing all list of groups.
group.php
<?php
$db = new Group($conn);
$res = $db->g_viewlist();
foreach ($res as $key => $value){
?>
<div class="col-lg-12" align="center" style="border:1.5px solid #59960b;padding-bottom:10px;padding-top:10px;">
<button class="btn2 btn-2 join" data-id="<?php echo $value['g_id']; ?>" data-toggle="modal" data-target="#joinModal" style="padding: 2px 2px;margin-left:50%"><strong> Join</strong></button>
<img src="./<?php echo $value['g_image']; ?>"class="pull-left" class="img-square" height="70" width="70" alt="Avatar">
<p align="left">
<strong class="font-1" style="color:#59960b;"><?php echo $value['g_name'];?> </strong><br>
<small style="font-family:courier,'new courier';" class="text">Member Since 2008<br></small>
<small style="font-family:courier,'new courier';" class="text-muted">Description:<?php echo $value['g_desc']; ?></small><br>
</p>
</div>
<?php
}
?>
SQL Query for showing all list of groups.
public function g_viewlist(){
$sql = "SELECT * FROM tbl_group ";
$result = $this->dbh->prepare($sql);
$result->execute();
$data = array();
while($row = $result->fetch(PDO::FETCH_ASSOC)){
$data[] = $row;
}
return $data;
}
this table is where i store the user id and the group id this is a diff table..assuming the g_id = 25 from tbl_group and group_id =25 from tbljoingroup

Answer 1

You need to retrieve the array of groups user is a member of and inside your foreach loop just search through this list. If user is a member of $value['g_id'] just skip loop iteration with continue.
If you want to hide only the button and still display the rest of the code then do something like this:
<?php
$db = new Group($conn);
$res = $db->g_viewlist();
foreach ($res as $key => $value) {
?>
<div class="col-lg-12" align="center" style="border:1.5px solid #59960b;padding-bottom:10px;padding-top:10px;">
<?php if (!$user.memberOf($value['g_id'])) { ?>
<button class="btn2 btn-2 join" data-id="<?php echo $value['g_id']; ?>" data-toggle="modal" data-target="#joinModal" style="padding: 2px 2px;margin-left:50%"><strong> Join</strong></button>
<?php } ?>
<img src="./<?php echo $value['g_image']; ?>"class="pull-left" class="img-square" height="70" width="70" alt="Avatar">
<p align="left">
<strong class="font-1" style="color:#59960b;"><?php echo $value['g_name'];?> </strong><br>
<small style="font-family:courier,'new courier';" class="text">Member Since 2008<br></small>
<small style="font-family:courier,'new courier';" class="text-muted">Description:<?php echo $value['g_desc']; ?></small><br>
</p>
</div>
<?php
}
?>
If you have user object saved in $user then create memberOf() method which will return true if user is a member of the group or false otherwise.
Note: Do not search database on each memberOf() execution. Do it once and save results in object's property for reuse.