abstraction

Author: mostafa6765

abstraction/readme.md

@@ -1,8 +1,45 @@
 # Abstraction
+Abstraction is a way to hiding details implementation and exposing only the essential features of the class to the outside world.
 
-* Abstraction is hiding the internal implementation.
+# Example
 
-# interface vs abstact class
+```php
+
+abstract class Car {
+  // Abstract classes can have properties
+  protected $tankVolume;
+ 
+  // Abstract classes can have non abstract methods
+  public function setTankVolume($volume)
+  {
+    $this -> tankVolume = $volume;
+  }
+ 
+  // Abstract method
+  abstract public function calcNumMilesOnFullTank();
+}
+
+
+class Toyota extends Car {
+  // Since we inherited abstract method, we need to define it in the child class, 
+  // by adding code to the method's body.
+  public function calcNumMilesOnFullTank()
+  {
+    return $miles = $this -> tankVolume*33;
+  }
+ 
+  public function getColor()
+  {
+    return "beige";
+  }
+}
+
+$toyota1 = new Toyota();
+$toyota1 -> setTankVolume(10);
+echo $toyota1 -> calcNumMilesOnFullTank();//330
+echo $toyota1 -> getColor();//beige
+```
+# Difference between interface and abstraction.
 
 * https://codeinphp.github.io/post/abstract-class-vs-interface/