Interface contains only the declaration of methods.

If any class which implement this interface must contain the declared functions in it.

A class can use any interface by using the implements keyword.

Example :

<?php

interface Interf
{
public function display(); 
}

class Demo implements Interf
{
function show()
{

echo "first method <br/>"; 

}

public function display()
{
	
echo "second method ";

}
}
$obj=new Demo();

$obj->show();

$obj->display();

?>

Output :

first method
second method