php7使用PDO连接mysql

1 打开php.ini配置文件，找到;extension=pdo_mysql，将前面的;去掉。

2 在php文件中连接使用数据库

<?php
  //echo "Hello world";
  $dsn = "mysql:host=localhost;dbname=db2019";
  $db = new PDO($dsn, 'root', '12345678');
  $rs = $db->query("select * from payment");
  $result_arr = $rs->fetchAll();
  print_r($result_arr);
  $db = null;
?>

Array ( 
  [0] => Array ( 
    [id] => 1 
    [0] => 1 
    [serial] => test1 
    [1] => test1 
  ) 
  [1] => Array ( 
    [id] => 2 
    [0] => 2 
    [serial] => test2 
    [1] => test2 
  )
)