socket_select() not a valid socket - php

Question

I got this error:
Warning: socket_select(): supplied argument is not a valid Socket resource in /volume1/web/is/xxxx/listen-new.php on line 12
PHP Warning: socket_select(): supplied argument is not a valid Socket resource in /volume1/web/is/xxxx/listen-new.php on line 12
this my snippet code
My code is:
$port = $this->port;
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($sock, 0, $port);
socket_listen($sock);
$this->clients[] = $sock;
$data = array();
while (true) {
$read = $this->clients;
$write = array(); //NULL
$except = array();//NULL
$sckt = socket_select($read, $write, $except, 0);
if($sckt === false){
echo "socket_select() failed, reason: " .
socket_strerror(socket_last_error()) . "\n";
}
elseif($sckt > 0) {
if (in_array($sock, $read)) {
$this->clients[] = $newsock = socket_accept($sock);
//var_dump($this->gps);
socket_write($newsock, "Connected\n");
//var_dump($this->gps);
/**try{
socket_getpeername($newsock, $ip); //error
echo "New client connected: {$ip}\n";
}
catch(Exception $e){
echo "error : $e->getMessage()\n";
}**/
$key = array_search($sock, $read);
unset($read[$key]);
}
foreach ($read as $read_sock) {
$data = #socket_read($read_sock, 2048);
if ($data === false) {
$gpsdisc = array_search($read_sock, array_column($this->gps, 'pid'));
$key = array_search($read_sock, $this->clients);
unset($this->clients[$key]);
unset($this->gps[$gpsdisc]);
echo "client disconnected.\n";
continue;
}
else{
$data = trim($data);
if (!empty($data)) {
var_dump($data);
$buf = bin2hex($data);
$start = substr($buf, 0,4);
if($start=="7878"){
$protocol = substr($buf, 6,2);
if($protocol=="01"){
$imei = substr($buf, 8,16);
$cariGPS = $this->cariGPS($imei);
if($cariGPS!=NULL){
$this->setGPS($imei,$read_sock,$cariGPS);
$reply = $this->authLogin($data);
$rep = hex2bin("$reply");
socket_write($read_sock, $rep, strlen($rep));
}
else
echo "$imei salah";
}
elseif($protocol=="15"){
//echo "$buf\n";
$this->reply($data);
}
elseif($protocol=="12"){
$hex12 = bin2hex($data);
//echo "$hex12\n";
}
else{
$hex12 = bin2hex($data);
echo "$hex12\n";
}
echo "$protocol\n";
}
else{
if($data=="where"){
//echo $data."\n";
$this->where($this->gps);
}
elseif($data=="quit"){
$gpsdisc = array_search($read_sock, array_column($this->gps, 'pid'));
unset($this->gps[$gpsdisc]);
socket_close($read_sock);
$key = array_search($read_sock, $this->clients);
unset($this->clients[$key]);
}
else{
echo "command not found\n";
}
}
}
}
}
}
}
socket_close($sock);
PS I also had to change $write = null and $except = null
Are there any solution for this?

Answer 1

It looks like you supplied only the server code but omitted the client code. Can you post the client code please? I guess the problem is there. With my test client (fyi I used socket_create) I cannot reproduce the problem you are reporting.
Also mine is php7 (if you are curious).
This may have some hints for you: Socket_read() says "not a valid resource"