PHP require files when use namespace - php

Question

I'm new to PHP namespace. and there is a problem when I use auto-load.
ROOT/Application/Instance.php
<?php
namespace Application;
class Instance {
public static $_database;
public function __construct() {
self::$_database = new \Application\Module\Database();
}
public static function database() {
return self::$_database;
}
public static function ID(){
return md5(uniqid(mt_rand(), TRUE) . mt_rand() . uniqid(mt_rand(), TRUE));
}
public static function autoload($_className) {
$thisClass = str_replace(__NAMESPACE__.'\\', '', __CLASS__);
$baseDir = __DIR__;
if (substr($baseDir, -strlen($thisClass)) === $thisClass) {
$baseDir = substr($baseDir, 0, -strlen($thisClass));
}
$_className = ltrim($_className, '\\');
$fileName = $baseDir;
$namespace = '';
if ($lastNsPos = strripos($_className, '\\')) {
$namespace = substr($_className, 0, $lastNsPos);
$_className = substr($_className, $lastNsPos + 1);
$fileName .= str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
}
$fileName .= str_replace('_', DIRECTORY_SEPARATOR, $_className) . '.php';
if (file_exists($fileName)) {
require $fileName;
}
}
public static function registerAutoloader() {
spl_autoload_register(__NAMESPACE__ . "\\Instance::autoload");
}
}
ROOT/Application/Module/Database.php
<?php
namespace Application\Module;
include 'FluentPDO/FluentPDO.php';
class Database extends Module {
public static $_instance;
public function __construct() {
if(self::$_instance === NULL) {
self::$_instance = new FluentPDO(new PDO("mysql:host=8273639.mysql.rds.aliyuncs.com;dbname=db", 'name', 'password'));
}
}
}
When I run this:
new \Application\Instance();
I got this error:
Fatal error: Class 'Application\Module\FluentPDO' not found in /mnt/www/airteams_com/public/Application/Module/Database.php on line 13
I'm pretty sure that 'FluentPDO/FluentPDO.php' exists. and the error shows a wrong path of the file. the right path is 'ROOT/Application/Module/FluentPDO/FluentPDO.php'
So how can i use a no namespace class in my situation? thanks.

Answer 1

When you are working with namespaces you must fully qualify each class unless it's a child of the current namespace.
As such the FluentPDO is probably on the root namespace which means you need to access it like such:
self::$_instance = new \FluentPDO(new \PDO("mysql:host=8273639.mysql.rds.aliyuncs.com;dbname=db", 'name', 'password'));