friendica-github/view/theme/duepuntozero/config.php

<?php
/**
 * Theme settings
 */


function theme_content(App &$a){
	if (!local_user()) {
		return;
	}

	$colorset = get_pconfig( local_user(), 'duepuntozero', 'colorset');
	$user = true;

	return clean_form($a, $colorset, $user);
}

function theme_post(App &$a){
	if (! local_user()) {
		return;
	}

	if (isset($_POST['duepuntozero-settings-submit'])){
		set_pconfig(local_user(), 'duepuntozero', 'colorset', $_POST['duepuntozero_colorset']);
	}
}


function theme_admin(App &$a){
	$colorset = get_config( 'duepuntozero', 'colorset');
	$user = false;

	return clean_form($a, $colorset, $user);
}

function theme_admin_post(App &$a){
	if (isset($_POST['duepuntozero-settings-submit'])){
		set_config('duepuntozero', 'colorset', $_POST['duepuntozero_colorset']);
	}
}

/// @TODO $a is no longer used
function clean_form(&$a, &$colorset, $user){
	$colorset = array(
		'default'=>t('default'), 
		'greenzero'=>t('greenzero'),
		'purplezero'=>t('purplezero'),
		'easterbunny'=>t('easterbunny'),
		'darkzero'=>t('darkzero'),
		'comix'=>t('comix'),
		'slackr'=>t('slackr'),
	);

	if ($user) {
		$color = get_pconfig(local_user(), 'duepuntozero', 'colorset');
	} else {
		$color = get_config( 'duepuntozero', 'colorset');
	}

	$t = get_markup_template("theme_settings.tpl" );
	/// @TODO No need for adding string here, $o is not defined
	$o .= replace_macros($t, array(
		'$submit'   => t('Submit'),
		'$baseurl'  => App::get_baseurl(),
		'$title'=> t("Theme settings"),
		'$colorset' => array('duepuntozero_colorset', t('Variations'), $color, '', $colorset),
	));

	return $o;
}