- str_replace: documentation ( source)
<?php
$result = "°Freenew°\x90ɮ\xC2\xA0";
//echo preg_replace('#[\x{0000}-\x{001F}\x{007F}-\x{00A0}]#u', '', $result);
//echo preg_last_error();
echo str_replace(array('\x{00A0}', '\x{00C2}', '\x{0090}'), '', $result);