Interface

An interface is similar to a class except that it cannot contain code.
An interface can define method names and arguments, but not the contents of the methods.
Any classes implementing an interface must implement all methods defined by the interface.
A class can implement multiple interfaces.
An interface is declared using the "interface" keyword.
Interfaces can't maintain Non-abstract methods.

Example 1

<?php
	interface a
	{
		public function dis1();
	}
	interface b
	{
		public function dis2();
	}

class demo implements a,b
{
	public function dis1()
	{
		echo "method 1...";
	}
	public function dis2()
	{
		echo "method2...";
	}
}
$obj= new demo();
$obj->dis1();
$obj->dis2();

?>

Output:

Example 2

<?php
	interface i1
	{
		public function fun1();
	}
	interface i2
	{
		public function fun2();
	}
class cls1 implements i1,i2
{
	function fun1()
	{
		echo "javatpoint";
	}
	function fun2()
	{
		echo "SSSIT";
	}
}
$obj= new cls1();
$obj->fun1();
$obj->fun2();

?>

Output: