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<?php

class Dynamic_Sidebars {

	private $i;
	private $sidebars;

	function __construct(){

		add_action( 'widgets_init', array( $this, 'init' ) );

	}


	function init() {

		$this->sidebars = apply_filters('dynamic_sidebars', array());

		$sidebars = $this->sidebars;

		foreach ( $sidebars as $name => $sidebar ) {

			$id = $this->slugify( $name );

			register_sidebar( array(
				'name'		=> __( $name, 'dynamic_sidebar' ),
				'id'		=> "$id-sidebar",
				'description'	=> __( $sidebar['description'], 'dynamic_sidebar' ),
				'before_widget'	=> '<div id="%1$s" class="widget %2$s">',
				'after_widget'	=> '</div>',
				'before_title'	=> '<h4 class="widgettitle">',
				'after_title'	=> '</h4>',
			) );

			add_action($sidebar['action'], array( $this, 'print_sidebar' ), $sidebar['priority']);

		}

	}

	function print_sidebar($name) {
		$id = $this->slugify($name);
		$active = is_active_sidebar( "$id-sidebar" );
		if ( $active ) {
			?>
				<div id="<?php echo $id; ?>" class="<?php echo $id; ?>">
					<div class="container">
						<div class="row">
							<?php dynamic_sidebar( "$id-sidebar" ); ?>
						</div>
					</div>
				</div>
			<?php
		}
	}


	function slugify( $string ) {

		//Lower case everything
		$string = strtolower($string);
		//Make alphanumeric (removes all other characters)
		$string = preg_replace("/[^a-z0-9_\s-]/", "", $string);
		//Clean up multiple dashes or whitespaces
		$string = preg_replace("/[\s-]+/", " ", $string);
		//Convert whitespaces and underscore to dash
		$string = preg_replace("/[\s_]/", "-", $string);
		return $string;
	}
}

new Dynamic_Sidebars();