Sample shortcode

div_shortcode.php

<?php
add_shortcode( 'div', 'wp_doin_div_shortcode' );

function wp_doin_div_shortcode($atts, $content = null) {
	ob_start();
	// let's fetch all of the arguments of the shortcode
	$atts = shortcode_atts( array(
		'class' => 'wp-doin',
		'heading' => 'Heading',
		'subheading' => 'Subheading',
			), $atts );
	// let's output the contents of the shortcode in a custom div
	?>
	<div class="<?php echo $atts['class']; ?>">
		<h2><?php echo $atts['heading']; ?></h2>
		<h3><?php echo $atts['subheading']; ?></h3>
		<?php echo do_shortcode( $content ); ?>
	</div>
	<?php
	return ob_get_clean();
}