gistfile1.php

<?php

/**
 * Returns the URL for an option.
 * If no option is defined, return all.
 * 
 * @param string $option The key of the item for which we want to get the URL.
 * @return string|array  Returns string if $option is defined. Returns array if option is false.
 */
function my_cool_theme_get_radiobutton_option( $option = false ) {
	$options = array(
		'option-1' => 'url1',
		'option-2' => 'url2',
		'option-3' => 'url3',
		'option-4' => 'url4',
		'option-5' => 'url5',
	);

	// If not option is defined, return the whole array.
	if ( ! $option ) {
		return $options;
	}

	// If the defined option does not exist, return a fallback URL.
	if ( ! isset( $options[ $option ] ) ) {
		return 'fallback-url-here';
	}

	// If we got this far, we're all good. Just return the desired URL.
	return $options[ $option ];
}