PHP Mysql $ Id问题无法仅使用$ id作为参数来检索数据

I am having problem of getting the values from mysql / php and I would appreciate if someone could help me. My problem is that I have a table called albums and in that table I have 6 columns which are id, album_name, artist, company, genre, price. I have written this code in my index.php:I am having problem of getting the values from