simple boilerplate wordpress shortcode

shortcode.php

/**
 * Boilerplate WordPress shortcode - can drop into functions.php 
 * Use: [bananify this="thing to add a banana to"] 
 */ 

function bananify_func( $atts ) {
    $a = shortcode_atts( array(
        'this' => 'something'
    ), $atts );

    $str = "<h1>";
    $str .= $a['this'];
    $str .= " banana";
    $str .= "</h1>";

    return $str;
}
add_shortcode( 'bananify', 'bananify_func' );