mysqli php select

Hello people,

I'm still quite new to php & mysqli and i am hoping somebody will guide me in the right direction with the situation i'm in at the moment.

I have 2 tables

companies
id, company_title, company_type, company_website, company_email, company_telephone

company_address
id, company_id, street_address, town_city, post_code


What i am wanting to do is use php, to display certain information on a page. e.g, I want to display all pubs in rotherham. But also want to display, the company_title.

I can issue the following query in phpMyAdmin and get the result i desire.

Code:

SELECT * FROM companies LEFT JOIN company_address ON companies.id = company_address.company_id
WHERE (companies.company_type = 'pub') AND (company_address.town_city = 'sheffield')

However when i try implementing this query into my php script i'm not getting anything displayed.

Here's my php.

PHP:

<?php

include("connect.php");
doDB;

$get_sql = "SELECT * FROM companies LEFT JOIN company_address ON companies.id = company_address.company_id WHERE (companies.company_type = '".$_POST["choose_company_type"]."') AND (company_address.town_city = '".$_POST["choose_company_location"]."')";

$get_res = mysqli_query($mysqli, $get_sql) or die(mysqli_error($mysqli));

if (mysqli_num_rows($get_res) > 0 ) {
    
    while ($info = mysqli_fetch_array($get_res)) {
        $id = $info['company_id'];
        $title = stripslashes($info['company_title']);
        $type = stripslashes($info['company_type']);
        $town = stripslashes($info['town_city']);
    
        $display_block .= "<h1>".$title."</h1><p>".$type." in <strong>".$town."</strong></p>";
        
    }
    
    mysqli_free_result($get_res);
    
    mysqli_close($mysqli);
            
}

?>

connect.php works fine with another script that I use to add info to the database so i dont think the problem lies within that.
(I do also have

PHP:

<?php echo $display_block; ?>

in the body of the page. )

Thank you.