I'm trying to do a search form where you can search in multiple database tables, and its working when i search in only one table but when i try with two tables im getting a "Undefined index" error.
This is the html code :
        <table class="table table-striped">
        <tr>
            <th>Customer Name</th>
            <th>Email</th>
            <th>Address</th>
            <th></th>
        </tr>
        <?php print("$searchoutput"); ?>
        </table>
And this is the php code above html tag. The code for searching is in the second php tag:
 <?php include("includes/database.php"); ?>
 <?php
$query = "SELECT 
        costumers.id,
        costumers.first_name,
        costumers.last_name,
        costumers.email,
        costumer_addresses.address,
        costumer_addresses.address2,
        costumer_addresses.city,
        costumer_addresses.state,
        costumer_addresses.zipcode
        FROM costumers 
        Inner Join costumer_addresses
        on costumer_addresses.costumer=costumers.id
        order by join_date DESC";
$result=$mysqli->query($query) or die ($mysqli->error.__LINE__);
?>
<?php 
    $searchoutput='';
    if(isset($_POST['search'])){
    $searchq=$_POST['search'];
    $searchq=preg_replace("#[^0-9a-z]#i", "", $searchq);
   $query = mysqli_query($mysqli,"SELECT * FROM costumer_addresses WHERE address LIKE '%$searchq%' OR address2 LIKE '%$searchq%' OR city LIKE '%$searchq%' OR state LIKE '%$searchq%' 
        UNION 
        SELECT * FROM costumers WHERE first_name LIKE '%".$searchq."%' OR last_name LIKE '%".$searchq."%' OR email LIKE '%".$searchq."%' ") OR die($mysqli->error.__LINE__);
    $count = mysqli_num_rows($query);
    if($count == 0){
        $searchoutput = 'There was no search results!';
    }else{
        while($row = mysqli_fetch_array($query)){
            $first_name=$row['first_name'];
            $last_name=$row['last_name'];
            $email=$row['email'];
            $address=$row['address'];
            $address2=$row['address2'];
            $city=$row['city'];
            $state=$row['state'];
            $searchoutput.='<tr>';
            $searchoutput.='<td>'.$row['first_name'].' '.$row['last_name'].'</td>';
            $searchoutput.='<td>'.$row['email'].'</td>';
            $searchoutput.='<td>'.$row['address'].' '.$row['city'].' '.$row['state'].'</td>';
            $searchoutput.='<td><a href="edit_customer.php?id='.$row['id'].'" class="btn btn-default btn-sm">Edit</a></td>';
            $searchoutput.='</tr>';
        }
    }
}
?>
 
    