- preg_replace: documentation ( source)
<?php
$result = "°Freenew°\x90ɮ\xC2\xA0";
//echo preg_replace('#[\x{0000}-\x{001F}\x{007F}-\x{00A0}]#u', '', $result);
echo preg_replace('#[\x00-\x1F\x90]#', '', $result);
//echo preg_replace('#[\x00-\x1F\x7F-\xA0]#', '', $result);
//echo preg_last_error();
//echo str_replace(array('\xA0', '\xC2', '\x90'), '', $result);