PHP PDO的FETCH_NUM、FETCH_BOTH、FETCH_ASSOC

不容易混淆的有：FETCH_CLASS,FETCH_COLUMN，FETCH_OBJ...

数据库的连接准备部分

$dsn = 'mysql:host=127.0.0.1;port=3306;dbname=cardslg';
$username = 'root';
$password = '';
$options = array(
    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
);
$pdo = new PDO($dsn,$username,$password,$options);

$stmt = $pdo->prepare("SELECT * FROM card_users");

1.FETCH_NUM

$stmt->setFetchMode(PDO::FETCH_NUM);
$stmt->execute();
$queries = $stmt->fetch();

file_put_contents("log.txt",print_r($queries,true));

结果：

Array
(
    [0] => 1
    [1] => lvpeilin
    [2] => 10
    [3] => 1
    [4] => 2016-12-16 11:55:30
)

2.FETCH_ASSOC

$stmt->setFetchMode(PDO::FETCH_ASSOC);
$stmt->execute();
$queries = $stmt->fetch();

file_put_contents("log.txt",print_r($queries,true));

结果：

Array
(
    [id] => 1
    [user_name] => lvpeilin
    [vip] => 10
    [consortium_id] => 1
    [created_at] => 2016-12-16 11:55:30
)

3.FETCH_BOTH

$stmt->setFetchMode(PDO::FETCH_BOTH);
$stmt->execute();
$queries = $stmt->fetch();

file_put_contents("log.txt",print_r($queries,true));

结果：

Array
(
    [id] => 1
    [0] => 1
    [user_name] => lvpeilin
    [1] => lvpeilin
    [vip] => 10
    [2] => 10
    [consortium_id] => 1
    [3] => 1
    [created_at] => 2016-12-16 11:55:30
    [4] => 2016-12-16 11:55:30
)