WP shortcodes to apply bootstrap grid

bootstrap_shortcodes.php

<?php

// [col size="foo-value"]
// Create the function that will handle the shortcode
function grid_column($attributes, $content = null) {
  // shortcode_atts is used to define default attribute values
  $attributes = shortcode_atts(array('size' => '12'), $attributes);
  
  // keep applying shortcodes to content
  $content = do_shortcode($content);

  return "<div class='col-md-{$attributes['size']}'>$content</div>";
}
// Register the shortcode
add_shortcode( 'col', 'grid_column' );

// [row]
function grid_row($attributes, $content = null) {
  return '<div class="row">' . do_shortcode($content) . '</div>';
}
add_shortcode( 'row', 'grid_row' );