PHP trying to use autoload function to find PDO class - php

Question

This has been bugging me for some time now and I can't seem to make sense of it.
My phpinfo reports that PDO is installed and I can connect to my database on my index.php file. But when I try to open a PDO connection on a namespaced class, php is trying to use my autoload function to find PDO.php which won't work.
My class is as follows:
abstract class {
protected $DB;
public function __construct()
{
try {
$this->DB = new PDO("mysql:host=$host;port=$port;dbname=$dbname", $user, $pass);
}
catch(PDOException $e) {
echo $e->getMessage();
}
}
}
And the error is
Warning: require_once((...)/Model/PDO.php): failed to open stream: No such file or directory in /(...)/Autoloader.php
Fatal error: require_once(): Failed opening required 'vendor/Model/PDO.php' (include_path='.:/Applications/MAMP/bin/php/php5.4.4/lib/php') in /(...)/Autoloader.php
As far I as know the autoloader should be called because PHP PDO extension is installed (yes I'm completely sure).
My autoload is as follows:
spl_autoload_register('apiv2Autoload');
/**
* Autoloader
*
* #param string $classname name of class to load
*
* #return boolean
*/
function apiv2Autoload($classname)
{
if (false !== strpos($classname, '.')) {
// this was a filename, don't bother
exit;
}
if (preg_match('/[a-zA-Z]+Controller$/', $classname)) {
include __DIR__ . '/../controllers/' . $classname . '.php';
return true;
} elseif (preg_match('/[a-zA-Z]+Mapper$/', $classname)) {
include __DIR__ . '/../models/' . $classname . '.php';
return true;
} elseif (preg_match('/[a-zA-Z]+Model$/', $classname)) {
include __DIR__ . '/../models/' . $classname . '.php';
return true;
} elseif (preg_match('/[a-zA-Z]+View$/', $classname)) {
include __DIR__ . '/../views/' . $classname . '.php';
return true;
}
}
Any help please?

Answer 1

It's not really an autoload issue. You are attempting to call a class on the root namespace.
By the looks of it, you are in some 'Model' namespace and calling PDO, you must remember that namespaces are relative by default.
What you want is to either call the the absolute path:
\PDO
or at the top of your file say you're going to use PDO like this:
use PDO;