diff --git a/01-classes.php b/Example/01-classes.php
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rename from 01-classes.php
rename to Example/01-classes.php
diff --git a/02-properties.php b/Example/02-properties.php
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rename from 02-properties.php
rename to Example/02-properties.php
diff --git a/03-methods.php b/Example/03-methods.php
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rename from 03-methods.php
rename to Example/03-methods.php
diff --git a/04-getters.php b/Example/04-getters.php
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rename from 04-getters.php
rename to Example/04-getters.php
diff --git a/05-setters.php b/Example/05-setters.php
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rename from 05-setters.php
rename to Example/05-setters.php
diff --git a/06-constructors.php b/Example/06-constructors.php
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rename from 06-constructors.php
rename to Example/06-constructors.php
diff --git a/07-inheritance-problem.php b/Example/07-inheritance-problem.php
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rename from 07-inheritance-problem.php
rename to Example/07-inheritance-problem.php
diff --git a/08-inheritance-solution.php b/Example/08-inheritance-solution.php
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diff --git a/09-public-private-protected.php b/Example/09-public-private-protected.php
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rename from 09-public-private-protected.php
rename to Example/09-public-private-protected.php
diff --git a/10-static.php b/Example/10-static.php
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rename from 10-static.php
rename to Example/10-static.php
diff --git a/11-const.php b/Example/11-const.php
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rename to Example/11-const.php
diff --git a/12-abstract-classes.php b/Example/12-abstract-classes.php
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rename to Example/12-abstract-classes.php
diff --git a/13-interfaces.php b/Example/13-interfaces.php
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rename to Example/13-interfaces.php
diff --git a/14-overriding.php b/Example/14-overriding.php
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rename to Example/14-overriding.php
diff --git a/15-overloading.php b/Example/15-overloading.php
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rename to Example/15-overloading.php
diff --git a/16-namespaces.php b/Example/16-namespaces.php
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rename to Example/16-namespaces.php
diff --git a/assets/img/xampp-app.png b/Example/assets/img/xampp-app.png
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rename from assets/img/xampp-app.png
rename to Example/assets/img/xampp-app.png
diff --git a/assets/img/xampp-download.png b/Example/assets/img/xampp-download.png
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rename from assets/img/xampp-download.png
rename to Example/assets/img/xampp-download.png
diff --git a/assets/img/xampp-homepage.png b/Example/assets/img/xampp-homepage.png
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rename from assets/img/xampp-homepage.png
rename to Example/assets/img/xampp-homepage.png
diff --git a/mobileLibs.php b/Example/mobileLibs.php
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rename from mobileLibs.php
rename to Example/mobileLibs.php
diff --git a/admin.php b/admin.php
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index 0000000..57a2248
--- /dev/null
+++ b/admin.php
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+<?php
+
+abstract class Device
+{
+
+    public $id;
+
+    public function __construct(int $id, string $brand, string $model, string $serialNumber)
+    {
+        $this->id = $id;
+        $this->brand = $brand;
+        $this->model = $model;
+        $this->serialNumber = $serialNumber;
+    }
+
+
+    public $brand;
+    public $model;
+    public $serialNumber;
+    public function getId()
+    {
+        return $this->model;
+    }
+
+    public function getSerialNumber()
+    {
+        return $this->serialNumber;
+    }
+
+    public function getDetail($device)
+    {
+        return $device->id;
+    }
+}
+
+class Mobile extends Device
+{
+
+    public $capacity;
+    public $price;
+
+    public function __construct(string $id, string $brand, string $model, string $serialNumber, string $capacity, string $price)
+    {
+        $this->capacity = $capacity;
+        $this->price = $price;
+        parent::__construct($id, $brand, $model, $serialNumber);
+    }
+
+    public function getDetail($device)
+    {
+        return Device::getDetail($device);
+    }
+}
+
+$mobile = new Mobile(5, 'Samsung', 'S20', 123456, '120GB', 1200);
+var_dump($mobile->getDetail($mobile));
diff --git a/devices.php b/devices.php
new file mode 100644
index 0000000..0c8d095
--- /dev/null
+++ b/devices.php
@@ -0,0 +1,75 @@
+<?php
+class Device
+{
+
+    public $brand;
+    public $model;
+    public $serialNumber;
+
+    public function __construct(string $brand, string $model, string $serialNumber)
+    {
+        $this->brand = $brand;
+        $this->model = $model;
+        $this->serialNumber = $serialNumber;
+    }
+
+    public function getSerialNumber()
+    {
+        return $this->serialNumber;
+    }
+}
+
+class DeviceManager
+{
+    public $serialNumber;
+
+    public function __construct(Device $device)
+    {
+        $this->serialNumber = $this->getDeviceSerialNumber($device);
+    }
+
+    public function getDeviceSerialNumber(Device $device)
+    {
+        return $device->getSerialNumber();
+    }
+}
+
+class Mobile extends Device
+{
+    public $capacity;
+    public $price;
+
+
+    public function __construct(string $brand, string $model, string $serialNumber, string $capacity, string $price)
+    {
+        $this->capacity = $capacity;
+        $this->price = $price;
+        parent::__construct($brand, $model, $serialNumber);
+    }
+
+    public function getMobileData()
+    {
+        return "<pre> $this->brand <pre> $this->model <pre> $this->serialNumber <pre/> $this->capacity <pre/>";
+    }
+}
+
+class Tablet extends Device
+{
+
+    public function __construct(string $brand, string $model, string $serialNumber, string $capacity, string $price)
+    {
+
+        parent::__construct($brand, $model, $serialNumber, $capacity, $price);
+    }
+}
+
+$mobile = new Mobile('iphone', '14S', '5678HP', '560GB', '1800');
+$tablet = new Tablet('IPad', 'ProMax', 'IP45236', '500GB', '2300');
+$device = new DeviceManager($mobile);
+
+
+echo ($device->getDeviceSerialNumber($mobile));
+echo "<pre>";
+echo ($device->getDeviceSerialNumber($tablet));
+echo "</pre>";
+echo $mobile->getMobileData();
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..42f60f4
--- /dev/null
+++ b/index.php
@@ -0,0 +1,68 @@
+<?php
+
+interface DeviceRepository
+{
+    public function createDevice(Device $device);
+    public function findId($deviceId, $array);
+}
+
+class Device
+{
+
+    public $id;
+    public $brand;
+    public $model;
+    public $serialNumber;
+    public function __construct(string $id, string $brand, string $model, string $serialNumber)
+    {
+        $this->id = $id;
+        $this->brand = $brand;
+        $this->model = $model;
+        $this->serialNumber = $serialNumber;
+    }
+}
+
+class MemoryRepository implements DeviceRepository
+{
+    public $devices = array();
+
+    public function createDevice(Device $device)
+    {
+        $this->devices[] = $device;
+    }
+    public function findId($deviceId, $array)
+    {
+        if (in_array($deviceId, $array)) {
+            return $deviceId;
+        }
+    }
+}
+
+
+class DeviceManager extends MemoryRepository
+{
+    public $repository;
+    public $device;
+    function __construct(MemoryRepository $repository, Device $device)
+    {
+        $this->repository = $repository;
+        $this->device = $device;
+    }
+
+    function addDevice($repository, $device)
+    {
+        $repository->createDevice($device);
+        return $repository;
+    }
+}
+
+$device1 = new Device(1, 'Samsung', 'S20', 'SG3454');
+$device2 = new Device(2, 'iPhone', 'X', 'IP7849');
+$device3 = new Device(3, 'Xiamoi', 'MI30', 'XM0948');
+
+$memory = new MemoryRepository();
+$addDevice = new DeviceManager($memory, $device2);
+$addDevice->addDevice($memory, $device1);
+$addDevice->addDevice($memory, $device2);
+
+var_dump($memory);