I have been looking into name spaces recently. I am creating an MVC framework and want to try to move towards PHP 5.3+ features.
Lets say I define a namespace, call it \Controller.
I then want to include a file which has the class of Home.
namespace Controller;
include "class.home.php";
The file contents:
class.home.php:
class Home {
public function hello() {
}
}
In this example, will Home be a part of the Controller namespace? or part of the global namespace?
I want to be able to access Home like new \Controller\Home(); Will the code above work like that?
The namespace of a class depends on the namespace it was declared in, not in which it was included. If the latter was the case, it'd be impossible to clearly know what namespace something will be in.
If you did not write namespace Foo\Bar\Baz; at the top of the file in which you declare the class, the class is in the global namespace, always.
In your case Home will not be part of the Controller namespace, because you need to define the namespace inside of class.home.php like:
namespace Controller;
class Home {
public function hello() {
}
}
And than you can:
namespace Controller;
include "class.home.php";
new \Controller\Home();
Related
I created a class at Controller folder of Cake project like this:
<?php
class Hi
{
function __construct(){ }
public function hi()
{
echo "hi!";
exit;
}
}
Then in a controller, I tried to include it:
<?php
namespace App\Controller;
use App\Controller\AppController;
include_once "Hi.php";
class MyController extends AppController
{
public function sayHi()
{
$a = new Hi();
$a.hi();
}
}
Here is the error I'm having:
Fatal error: Cannot declare class Hi, because the name is already in use in path\api\src\Controller\Hi.php on line 2
What's going on?
MyController.php and Hi.php are in the same folder. I'm using PHP 7.
Including a file won't make the classes in that file part of the current namespace, as namespaces are a per-file functionality.
http://php.net/...namespaces.importing.php#language.namespaces.importing.scope
Your Hi class will be declared in the global namespace, and your new Hi() will cause PHP to look for it in the current namespace, ie it will look for App\Controller\Hi, which doesn't exist, hence the composer autoloader kicks in, and will map this via a PSR-4 namespace prefix match to src/Controller/Hi.php, which will include the file again, and that's when it happens.
http://www.php-fig.org/psr/psr-4/
Long story short, while using new \Hi() would fix this, you better not include class files manually, or declare them in paths where they do not belong. Instead declare your files and classes in a proper autoloading compatible fashion, that is for example with a proper namespace in a path that matches that namespace, like
namespace App\Utils;
class Hi {
// ...
}
in
src/Utils/Hi.php
I have created a common class in app/Classes/Common.php
but whenever i try to access a model in a class function.
$new_booking_request = BookingRequest::where('host_id','=',Auth::id())
I am getting this error
Class 'App\Models\BookingRequest' not found
Even other classes like Auth, URL and Cookie are not working.
Is there a way to bring all classes in my Common class scope?
You get this issue when your namespace is wrong you or you forgot to namespace.
Since common.php is inside App/Classes, inside Common.php do somethng like this:
<?php namespace App\Classes;
use View, Auth, URL;
class Common {
//class methods
}
Also ensure your model class has the correct namespace, if BookingRequest.php is located inside App\Models then inside BookingRequest.php do this:
<?php namespace App\Models;
BookingRequest extends \Eloquent {
//other definitions
}
Then if you wish to use BookingRequest.php outside its namespace or in another namespace like so:
<?php namespace App\Classes;
use App\Models\BookingRequest;
use View, Auth, URL;
class Common {
//class methods
}
In Laravel 5 everything is namespaced, make sure your class has a proper namespace and that you are calling it using that same namespace you specified.
To include classes in another class make sure that you use the use keyword to import the necessary classes on top of your class definition. Also you can call the class globally with the \. Ex: \Auth, \URL and \Cookie
For the namespace in L5 here is a quick example:
<?php namespace App\Models;
class BookingRequest {
// class definition
}
then when trying to call that class, either call the full namespace path of the function, or include the function.
<?php
class HomeController extends Controller {
public function index()
{
$newBookingRequest = App\Models\BookingRequest::where('host_id','=',Auth::id());
}
}
OR
<?php namespace App\Controllers;
use App\Models\BookingRequest; // Include the class
class HomeController extends Controller {
public function index()
{
$newBookingRequest = BookingRequest::where('host_id','=',Auth::id());
}
}
PS:
Please use camelCase when defining class attributes and methods as this helps for a better code-styling and naming conventions when using the L5 framework.
I have a base abstract class, say Base.php located at /lib/Helper/Base.php. Now, I have another class, say Awesome.php located at /lib/Helper/Awesome/Awesome.php, and this class needs to extend Base.
I have defined my namespaces as follows:
Base.php
<?php namespace Helper;
abstract class Base
{
}
Awesome.php
<?php namespace Helper\Awesome;
class Awesome extends Base
{
}
Right now, this says that class Base was not found. I tried to use require_once and/or include to the path of Base.php and they also didn't work. What am I doing wrong?
You are including the file, and that is the right thing to do. But you are also using
namespaces.
the namespace is not a folder, that means the namespace 'Helper' is not a folder but a logical hierarchy. In order to use the class Base in he logical namespace Helper the Awesome class needs to extend the Base class with the full logical path i.e. \Helper\Base.
namespace Helper\Awesome;
class Awesome extends \Helper\Base {
}
or use the use/as keyword instead (like c# using statement) .
namespace Helper\Awesome;
use \Helper\Base as Base;
class Awesome extends Base
{
}
more information can be fount at the php.net site.
here is a direct reference: http://php.net/manual/en/language.namespaces.importing.php
I'm using php for my new project which is quite large. I feel the need to employ namespaces.
I have read many docs on it, but am confused practically about. Here is the scenario:
I have defined the following namespace and class:
namespace urlNS;
class URL
{
// content of the class
}
And then in another file, I want to define a class in the same namespace (urlNS) and also extend the URL class (which is a subset of urlNS namespace), and to do this, I have done:
namespace urlNS:
class Inc extends urlNS\url
{
// content
}
Now, I wanted to make use of a defined namespace twice (or even more), did I do it in a right way?
Base class definition:
<?php
namespace urlNS;
class URL {}
Subclass:
<?php
namespace urlNS;
class Inc extends URL {}
Using:
<?php
$url = new urlNS\URL();
$suburl = new urlNS\Inc();
Or with use keyword:
<?php
use urlNS\URL;
$url = URL();
I have been searching websites to try and get a handle on using PHP namespaces, but they all seem quite vague but what they're trying to do is easy to understand!
My question is: I have a file called people.php and in it is defined class called people. If I create another file called managers.php in the same folder can I define a class again called people which extends the original people class but in the namespace of managers, if so do I have to 'include' the original people.php and if so do I put the include after the writing: namespace managers?
Namespaces are a way to group your related classes in packages. What you describe could best be put under a single namespace like
<?php // people.php
namespace com\example\johnslibrary\people;
abstract class People {
}
and then
<?php // manager.php
namespace com\example\johnslibrary\people;
require_once 'path/to/People.php'; // can better use autoloading though
class Manager extends People {
}
because a Manager is a subclass of People, so there is not much of a reason to put them into their own namespace. They are specialized People.
If you want to Managers to be in their own namespace, you can do so, but have to use the fully qualified name when using the extends keyword, e.g.
<?php // manager.php
namespace com\example\johnslibrary\managers;
require_once 'path/to/People.php';
class Manager extends \com\example\johnslibrary\people\People {
}
or import the People class first
<?php // manager.php
namespace com\example\johnslibrary\managers;
use com\example\johnslibrary\People as People;
require_once 'path/to/People.php';
class Manager extends People {
}
See the PHP Manual on Namespaces for extensive documentation.
// people.php
<?php
namespace People;
class People {}
// managers.php
<?php
namespace Managers;
require_once __DIR__.'/people.php';
class People extends \People\People {}
I have old PHP Class and i need to use it in new PHP file as for example:index.php has to use iClass.php. But before using the OLD iClass.php i have to modify it as below, so that i can use it in index.php.
iClass.php:
namespace ic;
class iClass {
public static function callMeFromClass() {
echo 'OK - you have called me!';
exit;
}
}
index.php
namespace inex;
require_once 'iClass.php';
use ic\iClass;
iClass::callMeFromClass();