How does php connect to the database?

PHP has two methods to connect to the mysql database: mysqli and pdo.

The first method: use mysqli to connect to the mysql database

The code example is as follows

connect_error){
    die("连接失败：".$link->connect_error);
}
    $sql="select * from admins";
    $res=$link->query($sql);
    $data=$res->fetch_all();
    var_dump($data);

The second method: use PDO to connect to the database

The code example is as follows :

query($sql)->fetch();
var_dump($data);

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