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
 )