Working with HTML Tags in PHP

From PHP's point of view, HTML tags are ordinary strings. Let's, for example, use the <b> tag to output bold text:

<?php
	echo '<b>жирный</b>';
?>

You can use multiple echo statements:

<?php
	echo '<b>';
	echo 'жирный';
	echo '</b>';
?>

You can use concatenation:

<?php
	$str = 'жирный';
	echo '<b>' . $str . '</b>';
?>

Or like this:

<?php
	$str   = 'жирный';
	$open  = '<b>';
	$close = '</b>';
	
	echo $open . $str . $close;
?>

Using the <i> tag, output italic text.

Using the <br> tag, output a column of numbers from 1 to 9.