Custom WordPress shortcode that allows you to enforce a maximum number of clicks a certain URL should award points. Once this max has been reached, the link is no longer shown.

mycred_max_link

add_shortcode( 'mycred_max_link', 'mycred_render_max_link' );
function mycred_render_max_link( $atts, $content ) {

	// Make sure myCRED is installed
	if ( ! function_exists( 'mycred' ) ) return 'myCRED is not installed';

	// Not applicable for visitors
	if ( ! is_user_logged_in() ) return;

	$atts = shortcode_atts( array(
		'id'          => '',
		'rel'         => '',
		'class'       => '',
		'href'        => '',
		'title'       => '',
		'target'      => '',
		'style'       => '',
		'amount'      => 0,
		'ctype'       => 'mycred_default',
		'max_clicks'  => 0,
		'hreflang'    => '',   // for advanced users
		'media'       => '',   // for advanced users
		'type'        => ''    // for advanced users
	), $atts );

	// Check max click requirement
	if ( $atts['max_clicks'] > 0 ) {

		$mycred = mycred( $atts['ctype'] );

		global $wpdb;
		$count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$mycred->log_table} WHERE ref = 'link_click' AND data LIKE %s;", '%' . $atts['href'] . '%' ) );

		// If count has reached max we return nothing.
		if ( $count >= (int) $atts['max_clicks'] )
			return '';

	}

	// Let myCRED run the mycred_link shortcode.
	return mycred_render_shortcode_link( $atts, $content );
}

Does this code still work? how do I use it other than just adding it to functions.php?