PHP Beginner - What am i doing wrong? - php

Question

First of all, im a beginner so please excuse me if i don't mention things that could be important.
I have Sellers, that are in different countries in the world. Each country belong to a continent. Im trying to:
get the seller name
Fetch Database to see in what countries (China,Italy,Germany...) he offers his goods.
Then fetch another database and see in what continents (ASIA,EU) belong each country
Store the countries (Italy,Germany) to a variable $country_eu and $country_asia (China). So later i will add this variables to update database fields.
if($continent == 'ASIA') is not included in the code YET since i take one by one the steps. I want to make first EU work, then i figure out the rest.
include_once('../db.php');
session_start();
$seller_name = $_SESSION['seller_name'];
echo $seller_name;
if (!empty($_POST['flag_image'])){
$flags_array = $_POST['flag_image'];
$flags_string = implode(",",$flags_array);
}else{
$flags_string = '';
}
$cont_eu = '';
// Assign Flags to Continents
foreach ($flags_array as $flag_image){
$qry_find_flag_continent = " SELECT continent FROM flags WHERE flag_image = '$flag_image' ";
$result = $dbdetails->query($qry_find_flag_continent);
while($row = mysqli_fetch_array($result)) {
$continent = $row["continent"];
if ($continent == 'EU') {
$cont_eu .= $flag_image;
}
}
echo $cont_eu;
The problem with my code is that when i echo $cont_eu is giving me just 1 result(Germany) and not the EXPECTED (Italy,Germany)

Answer 1

Thank you all for your precious time and attempts to help. Here is the new code that works great.
include_once('../db.php');
session_start();
$seller_name = $_SESSION['seller_name'];
echo $seller_name.'<br>';
if (!empty($_POST['flag_image'])){
$flags_array = $_POST['flag_image'];
$flags_string = implode(",",$flags_array);
} else {$flags_string = '';}
// Assign Flags to Continents
foreach ($flags_array as $flag_image){
$qry_find_flag_continent = " SELECT continent FROM flags WHERE flag_image = '$flag_image' ";
$result = $dbdetails->query($qry_find_flag_continent);
while($row = mysqli_fetch_array($result)) {
$continent = $row["continent"];
if($continent == 'EU'){ $eu_flags_array[] = $flag_image;}
}
}
print_r($eu_flags_array); //Gives me Array ( [0] => Germany.png [1] => Italy.png )