remove all html codes using php

1<?php
2  // Remove all html codes from a string
3  	$html = '<p>I love <em>codes</em>.<br>We shall keep the learning going</p>';
4	echo strip_tags($html);
5	echo '<br>';
6	// Remove specific html tag/s from a string
7	echo strip_tags($html, '<br>');
8?>