php - 如何使用数组显示数据库中的所有数据

Question

我正在尝试将 $countries 连接到一个数组，该数组将显示数据库中的所有数据，它只显示我输入的最后数据。我是否可以显示所有数据？

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
     die("Connection failed: " . $conn->connect_error);
} 

$sql = "SELECT product_id, product_name , quantity FROM inventory";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
     // output data of each row
     while($row = $result->fetch_assoc()) {
        $tom = array(" ". $row["quantity"] . $row["product_name"]);
         $countries = $tom;
     }
} else {
     echo "0 results";
}

$conn->close();

Answer 1

因为您以错误的方式将数据分配给$countries:

$countries = array();
if ($result->num_rows > 0) {
     // output data of each row
     while($row = $result->fetch_assoc()) {
        $tom = array(" ". $row["quantity"] . $row["product_name"]);
        $countries[] = $tom; // use []
     }
} else {
     echo "0 results";
}