php foreach button issue - php

Question

What I exactly need:
inside the foreach for every element I create a button. Then connect to postgresql db, select data from the table by condition.
If there is a matching entry in the database then I display <span class="fa fa-heart"> </span>. If no entries then display <span class="far fa-heart"></span>. I need this output exactly inside <button> </button> tag.
<form method="POST">
<?php foreach ($rows as $data): ?>
<button class="btn btn-outline-danger mx-1" name=fav-click style="font-size: 11px;">
<?php
$linkk = pg_connect("host=localhost dbname=webportal user=postgres password=1234567");
$favor=(int)$data['obj_id'];
$id_usr=(int)$id;
$query = "select obj_id, usr_id from favorites where usr_id='$id_usr' and obj_id='$favor'";
$re = pg_query($linkk, $query);
$row1=pg_fetch_all($re);
if(pg_num_rows($re)==0)
{
echo '<span class="far fa-heart"></span>';
}
if(pg_num_rows($re)>0)
{
echo '<span class="fa fa-heart"> </span>';
}
?>
</button>
inside the form there also are
<input type=hidden name=obj_id value=<?= $data['obj_id'];?>>
<input type=hidden name=id_usr value=<?= $id; ?>>
in which I store the values ​​I need.
Outside the foreach I have:
<?php
if(isset($_POST['fav-click']) && isset($_POST['obj_id']) && isset($_POST['id_usr'])) {
$oo = $_POST['obj_id'];
$uu=$_POST['id_usr'];
if(pg_num_rows($re)==0)
{
$zapr="insert into favorites(obj_id, usr_id) values($oo, $uu)";
$done = pg_query($linkk, $zapr);
}
if(pg_num_rows($re)>0)
{
$zapr="delete from favorites where obj_id='$oo' and usr_id='$uu'";
$done = pg_query($linkk, $zapr);
}
}
?>
But it works not correctly because it always displays and does queries in the db for the last element of foreach. Doesn't matter if I click a button for another one.
How can I fix it?