<?php

function clean_utf8($s) {
	return iconv('UTF-8', 'UTF-8//IGNORE', $s);
}

function check_utf8($s) {
	return mb_check_encoding($s, 'UTF-8');
}

function clean_input(&$a) {
	if (isset($a) && is_array($a) && !empty($a))
		foreach ($a as $k => &$v)
			clean_input($v);
	elseif (is_string($a) && !mb_check_encoding($a, 'UTF-8'))
		$a = iconv('UTF-8', 'UTF-8//IGNORE', $a);
	return true;
}