PHP命名空间奇怪的行为。 再次触发调用PDO方法和__autoload？

Question

I've following class and initPDO fails after adding setAttribute

namespace DBInterface;
class DBInterface {
    protected function initPDO() {
       $dsn = sprintf('sqlsrv:Server=%s;Database=%s', DB_SQL_SERVERNAME, DB_DB_NAME);
       $this->obPDO = new \PDO($dsn, DB_SQL_USERNAME, DB_SQL_PASSWORD);     
       $this->obPDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }
}

Which gives PHP error:

Could not find class file: DBInterface/PDO in root lib directory nor build lib path
Trace: [file] => path\lib\DBInterface\DBInterface.php
        [line] => 23
        [function] => __autoload
        [args] => Array
            (
                [0] => DBInterface\PDO
            )

Do you see something stupid? I can not figure it out oO. Line 23 points at setAttribute method.

Answer 1

You just have a namespace issue. PDO exists in the root namespace, so you need a backslash at the beginning of your constants. Just like you do with new \PDO.

$this->obPDO->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);

Without the backslashes, PHP is looking for PDO inside your DBInterface namespace. As you can see in the error, it's look for DBInterface\PDO which doesn't exist.