WordPress Shortcode Starter

wp-shortcode-starter.php

<?php
/**
 * Add shortcode
 */
add_shortcode( 'button', 'aqua_btn_shortcode' );
function aqua_btn_shortcode( $attr, $content = "" ) {
    extract( shortcode_atts( array(
        'label' => 'Button',
        'link' => '#',
        'new_tab' => '',
        'class' => ''
    ), $attr ) );
	$html = sprintf(
		'<a href="%s"%s%s>%s</a>',
		$link,
		$new_tab ? ' target="_blank"' : '',
		$class ? ' class="' . $class . '"' : '',
		$label
	);
    return $html;
}