$replace_arr = array(' ', '\r\n', '\r', '\n', '\t', '\0', '\x0B', '\r\n', '\xc2\xa0', '<br \>');
$tx_p_poll = $snmp_poll->poll_1($modemIP, $modemCom, $preEqOid);
$tx_p = $tx_p_poll[$preEqRep];
$data = ($snmp_poll->replace($tx_p, $rep_hex));
$data = rtrim($data);
$data = str_replace($replace_arr, "", $data);
$data_arr = str_split($data, 4);
print_r($data);