{WP} shortcodes [bartag foo="foo-value"]

wp_shortcode.php

<?php
function bartag_func( $atts ) {
	$a = shortcode_atts( array(
		'foo' => 'something',
		'bar' => 'something else',
	), $atts );

	return "foo = {$a['foo']}";
}
add_shortcode( 'bartag', 'bartag_func' );

//usage:  [bartag foo="foo-value"]

wp_shortcode_with_content.php

<?php
function blocks( $atts, $content = null ) {
	extract(shortcode_atts(array(
		'border_radius' => 'no',
		'spacing' => 'no'
	), $atts));

	return '<div class="ef-blocks d-flex flex-column flex-md-row spacing-'.strtolower($spacing).' border-radius-'.strtolower($border_radius).'">'.$content.'</div>';
}
add_shortcode('blocks', 'blocks');

//usage:  [blocks border_radius='yes']Inner content to print[/blocks]