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What is Inheritance?:-
Inheritance means one class method or properties access to another class. The child class will inherit all public, private, protected methods or properties from the parent class.
Public Access Modifier:-
| <?php | |
| //Public Access Modifier | |
| class Mobile{ | |
| public $a; //access can anywhere | |
| public function displayParent(){ | |
| echo "Parent construct Called $this->a <br>"; //This is parent construct called below in child construct | |
| // $this->a = $z; | |
| // echo ; | |
| } | |
| } | |
| // $obj = $; | |
| // $obj = new mobile; | |
| // $obj->a = 20; | |
| // $obj->display(); | |
| class Nokia extends Mobile{ //This is child function extend parent function | |
| public function displayChild($z){ | |
| parent::displayParent(); //Calling parent function for print | |
| $this->a = $z; | |
| echo "This is child $this->a <br>"; | |
| $this->displayParent(); | |
| } | |
| } | |
| $obj = new Nokia; //This is object of child function | |
| // $obj->a; | |
| $obj->displayChild(20); //This is object of child function with arguments | |
| ?> |
by 
Private Access Modifier:-
| <?php | |
| //private Access modifier | |
| class Mobile{ | |
| private $a; //This is Private Access Modifier | |
| public function displayParent(){ | |
| // $this->a = 30; | |
| echo "This is parent $this->a"; | |
| } | |
| } | |
| // $obj = new Mobile; | |
| // $obj->a; //here, private Access modifier so, can't access this place | |
| // $obj->displayParent(); | |
| class Nokia extends Mobile{ | |
| public function displayChild(){ | |
| // $this->a = 30; | |
| // echo "This is child $this->a"; | |
| echo "This is private Access modifier in child class "; | |
| } | |
| } | |
| $obj = new Nokia; | |
| $obj->displayChild(); | |
| // $obj->a; | |
| ?> |
Protected Access modifier :-
| <?php | |
| //Protected Access modifier | |
| class Mobile{ | |
| protected $a; //This is Protected Access Modifier | |
| public function displayParent(){ | |
| // $this->a = 30; | |
| // echo "This is parent $this->a"; | |
| } | |
| } | |
| // $obj = new Mobile; | |
| // $obj->a; //here, protected access modifer so, access this place | |
| // $obj->displayParent(); | |
| class Nokia extends Mobile{ | |
| // protected $a; | |
| public function displayChild(){ | |
| $this->a = '.'; //here, protected access modifer so, access this place | |
| // echo "This is child $this->a"; | |
| echo "This is Protected Access modifier in child class $this->a"; | |
| } | |
| } | |
| $obj = new Nokia; | |
| $obj->displayChild(); | |
| // $obj->a; | |
| ?> |
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