Example of how to implement a shortcode

shortcode-function.php

<?php

/**
 * Custom shortcode callback function
 * 
 * @param array  $atts
 * @param string $content
 * @return string
 */
function my_shortcode_callback( $atts = array(), $content = '' ) {
	$defaults = array();
	$settings = shortcode_atts( $defaults, wp_parse_args( $atts ) );
	// Do Stuff
	return '';
}

add_shortcode( 'my_shortcode', 'my_shortcode_callback' );