PHP Inheritance

When a class is defined by inheriting the existing function of a parent class then it is called inheritance.

Inheritance in PHP allows a class to inherit members from another class within same PHP program.

PHP Inheritance Example

Let's take a simple example on inheritance in PHP.

<!DOCTYPE html>
<html>
<head>
   <title>Inheritance Example in PHP</title>
</head>
<body>
<?php
   class Myclass
   {
      public function displaying_function($argument_vl)
      {
         echo "Output :<b>".$argument_vl."</b><hr/>";
      }
      public function displaying_function_alone()
      {
         echo "This is PHP Inheritance Tutorial with Example<hr/>";
      }
   }
   class Anotherclass extends Myclass
   {
      public function displaying_function($argument_vl)
      {
         echo "Another Output: <b>".$argument_vl."</b><hr/>";
      }
   }
   $obj1 = new Myclass();
   $obj2 = new Anotherclass;
   $obj1->displaying_function('I am an argument value passed in displaying function in Myclass class');
   $obj1->displaying_function_alone();
   $obj2->displaying_function("I am also an argument value passed in displaying function but in Anotherclass class");
   $obj2->displaying_function_alone();
?>
</body>
</html>

Below is the sample output of the above inheritance example

Here is another example which will demonstrates inheritance in PHP.

<!DOCTYPE html>
<html>
<head>
   <title>Inheritance Example in PHP</title>
</head>
<body>
<?php
   class Like
   {
      public $whatILike;
      public function tellWhatULike()
      {
         return "I just like to read ".$this->whatILike." on CodesCracker";
      }
   }
   class LikeAnother extends Like
   {
      public function tellWhatULike()
      {
         return "I just like to read ".$this->whatILike." on CodesCracker";
      }
   }
   $objectLikeAnother = new LikeAnother();
   echo $objectLikeAnother->tellWhatULike();
   echo "<br/>";
   
   $objectLikeAnother = new LikeAnother();
   $objectLikeAnother->whatILike = "C++";
   echo $objectLikeAnother->tellWhatULike();
   echo "<br/>";
   
   $objectLike = new Like();
   echo $objectLike->tellWhatULike();
   echo "<br/>";
   
   $objectLike = new LikeAnother();
   $objectLike->whatILike = "PHP";
   echo $objectLike->tellWhatULike();
   echo "<br/>";
?>
</body>
</html>

Here is the sample output of the above example code on inheritance in PHP.