PHP oops Single inheritance Example

class Processes
{
	
	public function process1()
	{
		echo  'process 1 is completed';
	}

	public function process2()
	{
		echo  'process 2 is completed';
	}

	
}

class ChildProcess extends Processes
{
	
	public function process3()
	{
		echo  'process 3 is completed';
	}
	
}



$process = new Processes();

$process->process1(); // output is  process 1 is completed


$process->process2(); // output is process 2 is completed


// access parent class methods

$cprocess = new ChildProcess();

$cprocess->process1(); // output is  process 1 is completed


$cprocess->process2(); // output is process 2 is completed

$cprocess->process3(); // output is process 3 is completed

In the above example we have a class Processes with two methods

the class ChildProcess extends the Processes class.
 
suppose we want to complete a task that should 3 process 

levels then using inheritance,

not necessary to define already defined process1, process2. 

directly we can extend a parent

class and create a child one. Inheritance is very helpful 

to reduce code duplicating. Inheritance is

very simple to use and yet powerfull.