Show count instead of duplicate values on select - PHP - php

Question

I'm trying to build a demo website showcasing the food and/or products in your home ie. fridge or freezer.
I've got most of it down, dynamically creating a list with the items, but I would like to have the duplicates count up like 1x [product] instead of just appearing multiple times in the list like this:
.
My query and stuff looks like this - all inside a for loop.
$sql = "SELECT * FROM goods WHERE person_id = " . $_SESSION['ID'] . " AND room LIKE '" . $rooms[$count] . "'";
if ($result = mysqli_query($conn, $sql)){
if (mysqli_num_rows($result) > 0){
$output = "<ul>";
while ($row = mysqli_fetch_array($result)){
$output .= "<li class='varer'> " . $row['name'] . "</li>";
}
$output .= "</ul>";
}
}
Hope you can help - I'm not that experienced with PHP :)

Answer 1

Check the following code where I show you how to have a group by to have the quantity per item and also, how to use query with prepared statements to avoid sql injection:
// prepare and bind
$stmt = $conn->prepare("SELECT COUNT(*) AS QUANTITY, * FROM goods WHERE person_id = ? AND room LIKE ? BROUP BY name");
$stmt->bind_param("ii", $_SESSION['ID'], $rooms[$count]);
$stmt->execute();
$result = $stmt->get_result(); // get the mysqli result
if ($result) {
$output = "<ul>";
while ($row = $stmt->fetch_assoc()) {
$output .= "<li class='varer'> " . $row['QUANTITY'] . "x " . $row['name'] . "</li>";
}
$output .= "</ul>";
}

Answer 2

(using prepared statements)
$sql = "SELECT room,count(*) FROM goods WHERE person_id = ? AND room LIKE ? ";
$stmt = $conn->prepare($sql);
$stmt->bind_param('ss', $_SESSION['ID'], $rooms[$count]);
$stmt->execute();
result = $stmt->get_result();
if( $result->num_rows > 0 ){
$output = "<ul>";
while ($row = $result->fetch_assoc()){
$output .= "<li class='varer'> " . $row['name'] . "</li>";
}
$output .= "</ul>";
}
$stmt->close();