How to connect to database in PHP7

Recommended (free):PHP7

* Already in PHP7 Themysqllibrary is abolished, so you can only usemysqliandPDO

##mysqli object-oriented style

connect_error){ die('connect error:'.$mysqli->connect_errno);}$mysqli->set_charset('UTF-8'); // 设置数据库字符集$result = $mysqli->query('select * from customers');$data = $result->fetch_all(); // 从结果集中获取所有数据print_r($data); ?>

mysqliProcess-oriented style

PDO connection database

query('select * from customers'); $data = $result->fetchAll(PDO::FETCH_ASSOC); // PDO::FETCH_ASSOC表示将对应结果集中的每一行作为一个由列名索引的数组返回 print_r($data);} catch (PDOException $error){ echo 'connect failed:'.$error->getMessage();} ?>

You can use PDO or mysqli to connect to mysql, but it is more recommended to use PDO to connect to the database, because PDO supports 12 different database drivers. mysqli only supports mysql, and PDO has higher performance

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