为什么PDO_MySQL不返回整数？

Question

I'm migrating my PHP codes from mysql (deprecated in 5.5) to PDO_MySQL. However, mysql_fetch_row returns integer while PDOStatement::fetch returns strings for numbers. How can I make PDO behaves like the former one?

Result of mysql_fetch_row:

array(1) {
  ["id"]=>
  int(1)
}

Result of PDOStatement::fetch:

array(1) {
  ["id"]=>
  string(1) "1"
}

Answer 1

Set PDO::ATTR_EMULATE_PREPARES to false, if you really need it with loosely-typed PHP

If mysql_fetch_row returns you int for SUM either (I never cared to check) - then it does some magic like if (ctype_digit($val)) $row[$key] = (int)$val; - so you can do in your DBAL

As far as I understand the way prepared statements works, it uses the same packet structure for either sending and retrieving data, and this packet contains data type.

It looks like that server can return data in 2 formats - native and mysqlnd, depends on the request type. A latter one can be interpreted by client library to cast resulting value.