Fetch rows and check if has same value - php

Question

I'm very new to coding and trying to learn PHP and MYSQL. What I'm trying to do is, grouping the same CustomerID querys in the same table while making an echo. At the moment, my code echos all the querys seperated. I have a table like
ID CustomerID DATE Company
1 1 2018-11-19 A
2 1 2018-11-19 A
3 2 2018-11-19 B
4 3 2018-11-19 C
5 4 2018-11-19 D
6 4 2018-11-19 D
My code
$query = "SELECT `customers`.ID, `customers`.customerid, `customers`.date
FROM `customers` WHERE month(DATE)= month(CURRENT_DATE()) AND YEAR(DATE) = YEAR(CURRENT_DATE());
$result = $mysqli->query($query);
while($resultquery = $result->fetch_array())
{
$queryresult[] = $resultquery;
}
if (!empty($queryresult)) {
foreach($queryresult as $queryresults)
{
$id = $queryresults['id'];
$customerid = $queryresults['customerid'];
$date = $queryresults['date'];
?>
Then I echo it and the result is
Company Name: A
ID CustomerID DATE
1 1 2018-11-19
Company Name: A
ID CustomerID DATE
2 1 2018-11-19
Company Name: B
ID CustomerID DATE
3 2 2018-11-19
Company Name: C
ID CustomerID DATE
4 3 2018-11-19
<?php }} ?>
Etc..
But what I want is to compare customerID's and if there is more than one with same id, echo them as a group in the table.
Company Name: A
ID CustomerID DATE
1 1 2018-11-19
2 1 2018-11-19
Company Name: B
ID CustomerID DATE
3 2 2018-11-19
Company Name: C
ID CustomerID DATE
4 3 2018-11-19
I made an sql query with GROUP_CONCAT and used SEPARATOR '|') to group the result, it works but I dont think its the best to achieve this, so please help. Thank you

Answer 1

Map your data in a key-value array with Company as key (include company in the query:
$query = "SELECT customers.ID, customers.customerid, customers.date, company
FROM customers WHERE month(DATE)= month(CURRENT_DATE()) AND YEAR(DATE) = YEAR(CURRENT_DATE())";
$query = "SELECT `customers`.ID, `customers`.customerid, `customers`.date
FROM `customers` WHERE month(DATE)= month(CURRENT_DATE()) AND YEAR(DATE) = YEAR(CURRENT_DATE());
Then simplify the data collection using a key to group items:
$result = $mysqli->query($query);
$queryresult = [];
while($resultquery = $result->fetch_array())
{
$company = $resultquery['company'];
if (array_key_exists($company,$queryresult){
#$queryresult[$company] = [];
}
#$queryresult[$company][] = $resultquery;
}
An then you can present the information using foreach:
foreach($queryresult as $company => $items){
// header by company
echo "Company Name: $company \n";
echo "ID CustomerID DATE\n";
foreach($items as $item){
// items in company
echo "{$item['id']} {$item['customerid']} {$item['date']}\n";
}
}