How to use namespace in php? - php

Question

I'm developing a solution that i need use Amazon WebServices library. Their library use namespace in all the project and how i am a beginner in PHP development i need your help to understand better how it works.
Here is my class:
<?php
// include('AmazonSNS\vendor\aws\aws-sdk-php\src\Sdk.php');
// include('AmazonSNS\model\CustomCredentials.php');
use Aws\Sdk;
class AwsSns {
public $sns;
public $platformApplicationArn;
public function __construct(){
$sdk = new Sdk([
'version' => 'latest',
'debug' => false,
'retries' => 3,
'credentials' => [
'key' => CustomCredentials::SNS_KEY,
'secret' => CustomCredentials::SNS_SECRET
],
'Sns' => [
'region' => 'sa-east-1'
]
]);
$this->sns = $sdk->createSns();
$this->generatePlatformApplicationArn();
}
private function generatePlatformApplicationArn( ){
$result = $this->sns->createPlatformApplication( array(
// Name is required
'Name' => 'GCMPedro',
// Platform is required
'Platform' => 'GCM',
// Attributes is required
'Attributes' => array(
// Associative array of custom 'String' key names
'PlatformCredential' => "AIzaSyBYjNaE7ShuLc2y4mf53bVwszDt8XA-YTI" //__API_KEY__
),
));
$this->platformApplicationArn = $result->get('PlatformApplicationArn');
Util::generateFile('PlataformApplicationArn: '.$this->platformApplicationArn, 'a');
}
public function getEndpointArn( $token ){
$result = $this->sns->createPlatformEndpoint(array(
// PlatformApplicationArn is required
'PlatformApplicationArn' => $this->platformApplicationArn,
// Token is required
'Token' => $token,
//'CustomUserData' => 'string',
'Attributes' => array(
// Associative array of custom 'String' key names
'Enabled' => 'true'
),
));
Util::generateFile('EndpointArn: '.$result->get('EndpointArn'), 'a');
return( $result->get('EndpointArn') );
}
}
?>
1) About name space, to use it, Do have I include or not include the .php file?
Observation:
When i don't use the include, the php returns the following error message:
Fatal error: Class 'Aws\Sdk' not found in C:\Program Files
(x86)\VertrigoServ\www\AmazonSNS\extra\AwsSns.php on line 14
Sure of your attention i thank you so much.

Answer 1

When you haven't set up an autoloading like PSR-0 or PSR-4 (like in the common PHP frameworks is used) or something else, the neccessary file is not going to be loaded/included automatically when its being called. I guess you haven't such an autoloading set up, so you can include with the include keyword.
In the official documentation of PHP you can read all about namespaces.
Citate of the manual. 2 benefits:
In the PHP world, namespaces are designed to solve two problems that authors of libraries and applications encounter when creating re-usable code elements such as classes or functions:
Name collisions between code you create, and internal PHP classes/functions/constants or third-party classes/functions/constants.
Ability to alias (or shorten) Extra_Long_Names designed to alleviate the first problem, improving readability of source code.