Learn PHP Namespace and Class Loader easy way
Let’s take index.php file first.
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<?php2
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require_once __DIR__ . '/autoload.php';4
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use MyNamespace\Controllers\RiponController;6
use MyNamespace\Controllers\MasiurController;7
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$riponController = new RiponController();9
$masiurController = new MasiurController();10
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echo "<pre>";12
print_r($riponController->index());13
echo "</pre>";14
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echo "<hr>";16
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echo "<pre>";18
print_r($riponController->serviceFunctionOfRipon());19
echo "</pre>";20
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echo "<hr>";22
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echo "<pre>";24
print_r($riponController->serviceFunctionOfMasiur());25
echo "</pre>";26
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echo "<hr>";29
echo $riponController->demoView();30
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echo "<hr>";32
echo "<pre>";33
print_r($masiurController->myfunction());34
echo "</pre>";Now time for the autoload.php file. This is very important file which actually loads the classes dynamically.
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<?php2
spl_autoload_register(function ($class) {3
$prefix = 'MyNamespace\\';4
$base_dir = __DIR__ . '/';5
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$len = strlen($prefix);7
if (strncmp($prefix, $class, $len) !== 0) {8
return;9
}10
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$relative_class = substr($class, $len);12
$file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';13
if (file_exists($file)) {14
require $file;15
}16
});Let’s setup a class. The file also imports another class.
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<?php2
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namespace MyNamespace\Controllers;4
use MyNamespace\Services\MasiurService;5
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class RiponController7
{8
private $riponService;9
public function __construct()10
{11
$this->riponService = new \MyNamespace\Services\RiponService();12
}13
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public function index()15
{16
return [17
'hello' => 'world from Ripon Controller index',18
'details' => 'I am about the details of Ripon Controller. I hope you will like it.'19
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];21
}22
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public function serviceFunctionOfRipon()24
{25
return $this->riponService->index();26
}27
public function serviceFunctionOfMasiur()28
{29
$masiur = new MasiurService();30
return $masiur->index();31
}32
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public function demoView()34
{35
$myData = $this->riponService->index();36
return "37
<h1>Hello World</h1>38
<p>This is a demo view</p>39
<p>It is a demo view from Ripon Controller</p>40
<p style='color:red'>It is a demo view from Ripon Controller</p>41
".date('Y-m-d H:i:s')."<br>".$myData['name']."<br>".$myData['email']."<br>".$myData['phone']42
;43
}44
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}This project actually gives an idea of how the classes can be loaded dynamically.
Full source code can be found in this Github Repo: https://github.com/masiur/PHP-Namespace-Learn
