Prevent duplicates within FOREACH loop/statement - php

Question

I am using this code to send out emails to my relevent partners, the problem I have is that sometimes the partner ID comes up twice and send the partner 2 x emails (duplicate), how can I prevent this?
$get_partner_id = "SELECT partner_id FROM partners_locations WHERE location_id ='$location_id'";
if ($partner_ids = $connect->query($get_partner_id)) {
foreach ($partner_ids as $partner_id) {
$partner_id = $partner_id['partner_id'];
//CONVERT PARTNER IDS TO RELATED PARTNER NAME AND SEND
$get_partner_names = "SELECT partner_name FROM partners WHERE partner_id ='$partner_id' AND active ='yes'";
if ($partner_names = $connect->query($get_partner_names)) {
foreach ($partner_names as $partner_name) {
$partner_name = $partner_name['partner_name'];
// GET ADMIN EMAIL TEMPLATE
ob_start();
include (TEMPLATEPATH . '/quote/admin-email-template.php');
$admin_message = ob_get_clean();
#mail("alerts#myremovalsquote.com", "Referral for " . $partner_name . "", $admin_message, $admin_headers);
}
}
else {
}
}
}
else {
}

Answer 1

First, simplify your code to just use a single query. In general, when working with SQL, you don't need loops in the application code. Use a JOIN:
SELECT p.partner_name
FROM partners_locations pl JOIN
partners p
ON p..partner_id = p.partner_id AND p.active ='yes'"
WHERE pl.location_id = '$location_id';
Next, you probably have a data problem, where partners are listed multiple times in the data, somehow. You might want to investigate that, if these values should be unique. In the meantime, you can use SELECT DISTINCT:
SELECT DISTINCT p.partner_name
FROM partners_locations pl JOIN
partners p
ON p..partner_id = p.partner_id AND p.active ='yes'"
WHERE pl.location_id = '$location_id';