In Wordpress, this function will get a list of all parameters defined in all functions that are used as shortcodes. Why anyone would ever need something like this, I have no idea.

all-shortcode-args.php

<?php
/**
 * Gets all arguments for all shortcode functions and returns them as an array.
 *
 * @method  get_all_shortcode_args
 *
 * @param   boolean		    $ignore_native  Whether to ignore the native Wordpress shortcodes.
 *
 * @param   boolean                 $dedupe  Whether to return unique values or allow duplicates.
 *
 * @return  array                  A list of shortcode argument names as strings, without the dollar sign prefix.
 */
function get_all_shortcode_args($ignore_native = TRUE, $dedupe = FALSE)
{
	global $shortcode_tags;

	// What if I told you there were no shortcode tags?
	// What if I told you this isn't even Wordpress?
	if(!isset($shortcode_tags) || !$shortcode_tags) return array();

	// Define ignored shortcodes as array keys. Values don't matter.
	$known_shortcode_tags = array(
		'embed'           => null, // Native WP Shortcode
		'wp_caption'      => null, // Native WP Shortcode
		'caption'         => null, // Native WP Shortcode
		'gallery'         => null, // Native WP Shortcode
		'audio'           => null, // Native WP Shortcode
		'video'           => null, // Native WP Shortcode
		'hightouch_sct_1' => null // Ex. Your own shortcodes that you want to ignore.
		);

	// Now we get a list of shortcodes that want to act on, optionally filtered.
	$my_shortcode_list = ( $ignore_native ? array_diff_key($shortcode_tags, $known_shortcode_tags) : $shortcode_tags );

	/**
	 * Set up the array that will hold the args.
	 * As of now, this will hold every arg for every shortcode function
	 * I don't know what they fuck you want to do with the info, so this
	 * is how the data is returned for now.
	 */
	$all_args = array();

	foreach ($my_shortcode_list as $tag => $fn_name)
	{
		// The magic. Reflection API allows you to reverse engineer the function.
		$ref_fn = new ReflectionFunction($fn_name);

		/**
		 * The getParameters() method returns a ReflectionParameter object
		 *
		 * @link  http://www.php.net/manual/en/reflectionfunctionabstract.getparameters.php
		 */
		foreach ($ref_fn->getParameters() as $param)
		{
			// Oddly, I think name is the only property.
			array_push($all_args, $param->name);
		}

	}

	// Return the results, optionally deduped.
	return ($dedupe ? array_unique($all_args, SORT_STRING) : $all_args );

	/* Should look something like this if dedupe === false:

		Array
		(
		    [0] => atts
		    [1] => atts
		    [2] => content
		    [3] => code
		    [4] => atts
		    [5] => content
		    [6] => code
		)

	 */
}
?>