shortcode-Test

getting shortcode

// Add Shortcode
function custom_shortcode( $atts ) {

	// Attributes
	$atts = shortcode_atts(
		array(
			'post_id' => '',
		),
		$atts,
		'custom_shortcode'
	);

	     $parent_id = get_post_meta($post_id, '_wpcf_belongs_fair_id', true);
	      $values = $wpdb->get_col("SELECT wpcf_booth_number_1 FROM booth_postmeta WHERE _wpcf_belongs_fair_id= $parent_id");  
	return count($values);

}
add_shortcode( 'custom_shortcode', 'custom_shortcode' );