Description:
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   If you uncomment the '//echo "Bug";' and when you run this script ,you will get the expect result if you don't logout, and when you login and "ps -aux " you can find it.
   But where you "telnet 127.0.0.1 99999" you can't connect it .

Reproduce code:
---------------
<?php
if(pcntl_fork()){exit;} posix_setsid(); chdir("/"); umask(0);
$sock=socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_bind($sock,"127.0.0.1",99999);
socket_listen($sock); $R=array($sock);
while(1) { $T=$R; if($C=socket_select($T,$W=NULL,$E=NULL,0,0)) {
                foreach($T as $sock2) {
                        if($sock2==$sock) {
                                $client=socket_accept($sock);
                                array_push($R,$client);
                        }
                        else{ //echo "Bug";
                        //socket_getpeername($sock2,&$add,&$prot);
                        $B=socket_recv($sock2,$Buf,1024,0);
                        if($B==0 || chop($Buf)=="quit" || chop($Buf)=="exit") {
                                $I=array_search($sock2,$R);
                                unset($R[$I]);
                                socket_close($sock2);
                        }else socket_send($sock2,"Hello".$Buf,1024,0);
                        } } } } ?>