What are the best practices for handling database query results in PHP to avoid errors like "array to string conversion"?

When handling database query results in PHP, it is important to check the data type of the result before attempting to use it. If the result is an array, you cannot directly convert it to a string without causing an "array to string conversion" error. To avoid this error, you can use functions like `json_encode()` to convert the array to a string before using it in your code.

// Example of handling database query results to avoid "array to string conversion" error
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

if ($result) {
    while ($row = mysqli_fetch_assoc($result)) {
        $json_data = json_encode($row);
        echo $json_data;
    }
} else {
    echo "Error: " . mysqli_error($connection);
}