Carbon Fields Page Builder Add-on

cf_page_builder.php

<?php
use Carbon_Fields\Container;
use Carbon_Fields\Field;
use Carbon_Fields\Field\Complex_Field;

Container::make( 'post_meta', 'Page Builder' )//PAGE BUILDER FIELDS
	->show_on_post_type('page')
	->add_fields( array(
	Field::make( 'complex', 'crb_layouts' )
	    ->set_layout('tabbed-vertical')
		->setup_labels(array(
		    'plural_name' => 'Sections',
		    'singular_name' => 'Section',
		))
		->add_fields( 'dynamic_section', array(
			Field::make("separator", "section_settings"),
            Field::make('checkbox', 'full_width_section')->set_width(20),
            Field::make('checkbox', 'content_contained')->set_width(20),
            Field::make('text', 'section_class')->set_width(30),
            Field::make('image', 'section_background_image')->set_value_type( 'url' )->set_width(30),
            Field::make('text', 'section_heading'),
            Field::make( 'complex', 'columns' )
             ->set_layout('tabbed-vertical')
             ->set_max(6)
             ->setup_labels( array(
                'plural_name' => 'Columns',
                'singular_name' => 'Column'
             ))   
            ->add_fields( 'Column', array(
                Field::make('text', 'column_class'),
                Field::make( 'rich_text', 'column_content' )->set_width(50)
            ))
		)),
));	
function carbon_parse_shortcodes($meta_string){//for use of shortcodes in rich text
	return apply_filters('the_content', $meta_string);
}
function bg_image($bg){ //background image function
	if ($bg){
		$background_image = "background:url('".$bg."');background-size:cover;background-repeat:no-repeat;background-position: center center;";
    	return $background_image;
	}else{
		return '';
	}
}
function carbon_display_page_builder() {//call function in pages that will use this
	$layouts = carbon_get_the_post_meta( 'crb_layouts', 'complex' );
	if (!empty($layouts)){
		foreach ( $layouts as $layout ) {
			$function_name = 'carbon_print_layout';
			if ( function_exists( $function_name ) ) {
				call_user_func( $function_name, $layout );
			}
		}
	}
}
function carbon_print_layout($layout) {//view fields
	?>
	<div class="section <?= $layout['full_width_section'] ? 'container-fluid' : 'container'; ?> <?= $layout['content_contained'] ? 'content-contained' : ''; ?> <?= $layout['section_class']; ?>" style="<?=bg_image($layout['section_background_image'])?>">
		<?php if ( $layout['_type'] === '_dynamic_section' ): ?>
				<?php if ( $layout['section_heading'] ): ?>
					<div class="row row-heading">
						<div class="col-sm-12 text-center">
							<h3><?= $layout['section_heading']; ?></h3>
						</div>
					</div>
				<?php endif; ?>
			<div class="row flexible-content">
				<?php $columns = $layout['columns']; ?>
				<?php if (!empty($columns)): ?>
					<?php foreach($columns as $column ): ?>
						<?php $max_columns = count($columns);
							$col_html = ''; 
							if($max_columns === 5) {
								$col_class = 15;
							} else {
								$col_class = (12/$max_columns);
							}
							?>
						<div class="<?= $max_columns === 5 ? 'col-sm-2 ' : ''; ?> col-sm-<?=$col_class;?> <?= $column['column_class']; ?>">
							<?= carbon_parse_shortcodes($column['column_content']); ?>
						</div>
					<?php endforeach; ?>
				<?php endif; ?>
			</div>
		<?php endif; ?>
	</div>
<?php
}