WordPress shortcodes with attributes. Originally published on http://colorlib.com/wp/shortcodes-can-add-life-wordpress-themes/

gistfile1.php

<?php 

// Enhanced subscription feature with attributes
function subscribe_multilink_shortcode( $atts ) {
    extract( shortcode_atts( array(
        'subtype' => 'RSS',
        'subtypeurl' => 'http://feeds.feedburner.com/MyBlog',
    ), $atts, 'multilink' ) );
      return sprtinf( 'Get our posts and latest updates delivered directly to your inbox<a href="%1$s">by %2$s</a>.',
        esc_url( $subtypeurl ),
        esc_html( $subtype )
    );
}
add_shortcode( 'subscribe', 'subscribe_multilink_shortcode' );

?>