PHP Class Inheritance call parent constructor

Today, We want to share with you PHP Class Inheritance call parent constructor.In this post we will show you php constructor parameters, hear for how to call a constructor for a parent class php we will give you demo and example for implement.In this post, we will learn about php parent constructor with arguments with an example.

PHP Class Inheritance call parent constructor

There are the Following The simple About PHP Class Inheritance call parent constructor Full Information With Example and source code.

As I will cover this Post with live Working example to develop PHP Class Inheritance for Beginners, so the some multilevel inheritance in php for this example is following below.

PHP Class Inheritance Example :1

The following simple PHP source code display how to call current class with self.

blood = $blood;
      if($name)
      {
        $this->name = $name;
      }
    }
  }

  class Mammal extends Product
  {
    public $itemVarient;
    public $legs;

    function __construct($itemVarient, $legs, $name=NULL)
    {
      parent::__construct("warm", $name);
      $this->itemVarient = $itemVarient;
      $this->legs = $legs;
    }
  }

  class Car extends Mammal
  {
    function __construct($itemVarient, $name)
    {
      parent::__construct($itemVarient, 4, $name);
      self::bark();
    }

    function bark()
    {
      print("$this->name says 'woof!'");
    }
  }

  $d = new Car("Black and Tan", "Angus");
?>

Example 2

The following PHP Source code display how to call parent constructor.

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_firstVal = $val1;
    $this->_secondVal = $val2;
  }

  public function add() {
    return $this->_firstVal + $this->_secondVal;
  }

  public function subtract() {
    return $this->_firstVal - $this->_secondVal;
  }

  public function multiply() {
    return $this->_firstVal * $this->_secondVal;
  }

  public function divide() {
    return $this->_firstVal / $this->_secondVal;
  }
}

class liveCalcDemo extends Calculator {
  private static $_allowedFunctions = array( "pow" => 2, "sqrt" => 1, "exp" => 1 );

  public function __construct( $val1, $val2=null ) {
    parent::__construct( $val1, $val2 );
  }

  public function __call( $myMethodsNm, $arguments ) {
    if ( in_array( $myMethodsNm, array_keys( liveCalcDemo::$_allowedFunctions ) ) ) {
      $functionArguments = array( $this->_firstVal );
      if ( liveCalcDemo::$_allowedFunctions[$myMethodsNm] == 2 ) array_push( $functionArguments, $this->_secondVal );
      return call_user_func_array( $myMethodsNm, $functionArguments );
    } else {
      die ( "<p>Method 'liveCalcDemo::$myMethodsNm' doesn't exist</p>" );
    }
  }
}
$ca = new liveCalcDemo( 3, 4 );
echo "<p>3 + 4 = " . $ca->add() . "</p>";
echo "<p>3 - 4 = " . $ca->subtract() . "</p>";
echo "<p>3 * 4 = " . $ca->multiply() . "</p>";
echo "<p>3 / 4 = " . $ca->divide() . "</p>";
echo "<p>pow( 3, 4 ) = " . $ca->pow() . "</p>";
echo "<p>sqrt( 3 ) = " . $ca->sqrt() . "</p>";
echo "<p>exp( 3 ) = " . $ca->exp() . "</p>";

?>

PHP Overriding Methods

simply create a method with the same name in the child class.

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getSetMethods();  //PHP Calls ParentClass::getSetMethods() 
$childObj = new ChildClass; 
$childObj->getSetMethods();   //PHP Calls ChildClass::getSetMethods()  
?>

redefine methods in subclasses

parent::getSetMethods();

PHP Preserving the Functionality of the Parent Class

 peel(); 
        $this-> slice(); 
        $this-> eat(); 
      } 
    } 
    class phone extends item { 
        public function consume() { 
          echo " <p> I'm breaking off a phone... </p> "; 
          parent::consume(); 
        } 
     } 

     $game = new item; 
     $game->consume(); 
                 
     $phone = new phone; 
     $phone->consume();   
                     
?>  

PHP final Classes and Methods

create a final class:

final class MyClass { 

} 

class ParentClass { 
   public final function myMethod() { 
            echo "A PHP Simple method"; 
   } 
} 

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Read :

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Summary

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