If I'm using namespace and for example I have the following directory tree
Test/someclass.php
Test/someotherclass.php
can I simply do
use \Test\someotherclass
or I need first to do
require 'Test/someotherclass.php'
and then I can actually use that class
because currently when I do that I get the following error
Fatal error: Class 'Test\someOtherClass' not found in
C:\xampp\htdocs\test\Test\someClass.php on line 10
As said in the comments the namespace and the use statement don't load anything by default.
But you can use an autoloader based on namespace. You have a standard called psr-0 for autoload.
Related
I have this in my controller:
if (!defined('BASEPATH'))
exit('No direct script access allowed');
use xampp\htdocs\client\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Spreadsheet;
use xampp\htdocs\client\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx;
But here is the error I am seeing after running the code
Message: Class 'xampp\htdocs\client\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Spreadsheet' not found
Filename: C:\xampp\htdocs\client\application\controllers\admin\Home.php
You appear to have confused use and include/require.
A use statement is for namespace importing and aliasing. It says "when I use the class name Foo, what I actually mean is Something\Something\Foo. That full name may look like a Windows file path, but the \ here is actually PHP's namespace separator, and doesn't directly relate to the location on disk.
In this case, you would write:
// Alias these class name so I don't have to write them in full in this file
use PhpSpreadsheet\Spreadsheet;
use PhpSpreadsheet\Writer\Xlsx;
If you want to reference the code in a particular file, you need the include and require family of keywords. Those say "load this PHP file, and execute the code in it, including class and function definitions.
So the following would make sense:
// Load the file
require_once 'xampp\htdocs\client\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Spreadsheet.php';
require_once 'xampp\htdocs\client\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx.php';
However, most PHP libraries are built to be autoloaded, so you don't have to name each file manually. Generally, you don't even need to configure the autoloading itself, instead you'd use Composer to install them, and it would set up the autoloader for you.
You would then write, in the main entry point of your code:
require_once 'vendor/autoload.php';
And the classes would be loaded automatically when referenced. Note that you probably still want the use lines, though, and those do have to be in each file (because each file can use the same alias to reference different classes).
I think this is very simple for many of you, but in the moment I got stuck with this. I have the following part of code:
header.php
include "facebook/autoload.php";
use Facebook\FacebookRedirectLoginHelper;
test.php
include "header.php";
$helper = new FacebookRedirectLoginHelper($redirect_url);
Why do I always get this error:
Fatal error: Class 'FacebookRedirectLoginHelper' not found in test.php on line
I thought when I include a PHP file, classes can also be used. But in this case not, why? I think I do not understand how this autoload and use works, so I would be happy for some explanation.
PHP does not inherit the namespaces nor the use statements of included/required files. This is intentional as otherwise if you include 2 files using a class aliased the same way you will get errors and you might not need all those classes in firs place.
If a class requires a namespace it has to have use statement defined with the full namespace to the particular class they need. Except in the cases where there might be aliasing. For example if you have:
// file1.php
use \My\Cool\LogWriter as Writer;
and
// file2.php
use \My\Cool\FileWriter as Writer;
Now both classes are accessible as Writer.
// test.php
require 'file1.php';
require 'file2.php';
In which case if you don't declare which class from which space you want this will give nasty error that class Writer is defined, which is true, but it is also true that the two classes are 2 separate ones.
For more information on namespaces in PHP5 see (http://php.net/manual/en/language.namespaces.php).
As a side note:
Every file, if not namespace declaration is provided is considered in the global namespace.
If a use is without leading slash the namespace might be considered relative to the current. (unsure but I think it depends on the autoloader?) (Reference here: https://stackoverflow.com/a/4879615/1747193)
This is a sample code:
sample code
I want to call it in another page:
include 'root of class file';
$r = new ImagineResizer();
I got this error:
Fatal error: Class 'ImagineResizer' not found in C:\WampDeveloper\Websites\example.com\webroot\images.php on line 13
Also call the function:
$r->resize('c:/test1.jpg', 'c:/test2.jpg');
As seen in your sample code the class is located in another namespace :
<?php
namespace Acme\MyBundle\Service;
use Symfony\Component\HttpFoundation\File\File;
use Imagine\Image\ImagineInterface;
use Imagine\Image\BoxInterface;
use Imagine\Image\Point;
use Imagine\Image\Box;
class ImagineResizer {
//-- rest of code
}
To use a class in another namespace you need to point out where the file is :
First include the class (manual or with autoloading)
Then u can create an instance in 2 ways. First way with the use-keyword
use Acme\MyBundle\Service\ImageResizer;
$object = new ImageResizer();
Or point to the class absolute :
$object = new \Acme\MyBundle\Service\ImageResizer();
Hopefully, this will help you out some:
Make sure you include the actual file - not just the folder where it lies.
Make sure that the file you're calling the class from uses the same namespace as your class file. If it doesn't, you have to call the class using the full namespace.
Profit.
The namespaces really had my patience go for a spin when I started using them, but once you're used to it it's not too hard. I would recommend using an autoloader though. It's a bit of a hassle to set up, but once it's done it helps out a bunch.
Namespaces: http://php.net/manual/en/language.namespaces.php
Autoloader: http://php.net/manual/en/function.spl-autoload-register.php
I just wanna use a namespace in another file, to use the class in it, but im too retarded to do this...
first file:
namespace fun;
use fun\kjr\trouble;
$trouble = new trouble('http://someURL');
second file:
namespace fun\kjr;
class trouble { ... }
This is the error i get:
Error: Fatal error: Class 'fun\kjr\trouble' not found in D:\wamp\www\fun\index.php on line 8
Where did I declare a wrong namespace? Oo
Greetings
I had to include my class aswell.
use namespace
only makes the class available in the actual context.
It does NOT include it, so you can cause it.
use
include_once('your.file')
to do that!
Thanks #Michael Berkowski for helping.
The problem (from what I can see) is you haven't specified an autoloader (e.g. with spl_autoload_register()) or haven't included the file in your code. The use statement will only find a class for you if you have an autoloader in place, otherwise you must include your code ahead of time with include/include_once or require/require once.
I would start with making an autoloader and registering it and then it may be wise to map your namespaces to directory structure as specified by PSR-0.
As the title says, when I instantiate a class I get this message :
Fatal error: Class 'Envato\RecursiveIteratorIterator' not found in C:\Users\rgr\Apache\htdocs\Roland Groza [ 3.0 ]\class\envato\envato.php on line 359
You can view the class here : Class ;
I'm instantiating from another file :
require("envato.php");
$test = new Envato\EnvatoAPIWrapper();
echo "User Vitals : ".$test->get_user_vitals("chaoscod3r")."<br>";
The class is wrapped with a namespace, so that might have something to do with it, but I wasn't sure since it's been a few years since I haven't coded PHP. Hopefully someone has an idea what is it that I'm doing wrong :)
To access non-namespaced classes like the internal classes of PHP and SPL inside of a namespace you have to use the fully qualified class name like this:
new \RecursiveIteratorIterator();
or import it explicitly at the beginning:
use \RecursiveIteratorIterator;
and then use it normally like you do.
Add a use statement at the top of your namespace...
use \RecursiveIteratorIterator;
If you don't then PHP expects RecursiveIteratorIterator to exist within your current namespace, rather than in the global namespace (indicated by the leading \)