Fatal error: exactly/the/good/way/class not found - php

I got the Fatal Error:
Fatal error: Class 'app\Autoloader' not found in C:\wamp64\www\WE\index.php
In other words:
Fatal error: exactly/the/good/way/class not found
begin of my script index.php
<?php
use \app\Autoloader;
Autoloader::register();
Begin of my autoloader script:
namespace app;
class Autoloader{...}
Arborescence:
Racine local server
app
[...]
Autoloader.php
index.php
Why this fatal error ?? The way mentionned in the error php is right...
Thaks for help !


The use statement will need to have the class available first. Since you haven't added the autoloader, you'll have to require_once the PHP file containing the autoloader, then use the class to import it into your namespace.
After the autoloader is present, it will have the responsibility of finding and loading the classes as they're use'd.

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php Uncaught Error: Class 'BitWasp\Bitcoin\Key\PrivateKeyFactory' not found

im trying to add a library to my php. I already downloaded all the files from composer but a fatal error happended. here is my code :
require_once('vendor/autoload.php');
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Address\AddressCreator;
use BitWasp\Bitcoin\Key\PrivateKeyFactory;
use BitWasp\Bitcoin\Key\KeyToScript\Factory\P2pkhScriptDataFactory;
//Rest of my code
ERROR 1 -> Uncaught Error: Class 'BitWasp\Bitcoin\Key\PrivateKeyFactory' not found
ERROR 2 -> Class 'BitWasp\Bitcoin\Key\PrivateKeyFactory' not found

Shouldn't that namespace be BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory?
See here https://github.com/Bit-Wasp/bitcoin-php/blob/1.0/src/Key/Factory/PrivateKeyFactory.php#L5

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When I tray to access my neo4j-DB via Graphaware's php-client using http-protocol, I get the following error message:
Fatal error: Class 'GraphAware\Common\Result\AbstractRecordCursor' not found in ...
On the other hand when I'm using the bolt-protocol t says:
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At the beginning of my code I have used
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I've a very strange issue. In one class "SMSNotifier" I have
require_once (__DIR__ . "/../InvitationNotifier.php");
[...]
class SMSNotifier extends InvitationNotifier {
[...]
}
this class is included in another script which is called from the cli. When calling this script I get
PHP Fatal error: Class 'InvitationNotifier' not found in [...]/include/classi/notifiche/notifiers/SMSNotifier.php on line 12
The strange thing is that if I replace the require_once with a require I get instead
PHP Fatal error: Cannot redeclare class InvitationNotifier in [...]/include/classi/notifiche/InvitationNotifier.php on line 11
What could be the issue here?
Thank you in advance for any thought. I've ran out of them...

I've continued trying to understand the issue and I've found out that there was a circular dependency. I've "cut it" down and the issue is gone. Hope this can help someone

You should not just be loading up files like it's 1990. Use Composer (PHP) and follow PSR-4 http://www.php-fig.org/psr/psr-4
composer.json
{
"autoload": {
"psr-4": {"InvitationNotifier\\": "lib/"}
}
}
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I have the latest version of swiftmailer. Is there some preference settings I need to do?
I have tried including the Validate.php file, but then I get the error: PHP Fatal error: Class 'Swift_DependencyContainer' not found.
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The code I am using for the validation is:
if (!Swift_Validate::email($email))
{ $error = true; }
Any help would be greatly appreciated. Using latest Apache and PHP.

Try require_once dirname( __FILE__) . '/lib/swift_required.php'; to use the built-in autoloader, where lib is subfolder of folder where is the current file ( for default directory structure of the library )

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I am learning framework2 and I am following this:
http://framework.zend.com/manual/2.0/en/user-guide/routing-and-controllers.html
But I'm getting this error:
PHP Fatal error: Class 'AlbumTest\Bootstrap' not found in
/home/ben/ZendSkeletonApplication/path/to/zf2-tutorial/module/Album/test/AlbumTest/Controller/AlbumControllerTest.php
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