How to connect php to mysql and query data

How to connect php to mysql and query data: first create a PHP sample file; then connect to the database through the username and password; and finally query through the query statement "select* from goods".

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php connection and query mysql database

 query($sql);
print_r($results);
//遍历循环打印数据
while ($row = mysqli_fetch_array($results))
{
//    print_r($row);
    echo $row['goods_name'];
    echo "
";
}
//释放
mysqli_free_result($results);
//关闭连接
mysqli_close($mysql);
?>

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