PHP socket processing does not come over the data stream, how to avoid (as if it is blocked)

PHP socket processing does not come over the data flow, how to deal with (as if it is blocked)
Requirements: PHP accepts a hardware to send data to 8888 port, if received, should socket_send function return "\xfa\x01\x01\xff\xaa\xaa\x00\x01\x00\x00\x00\x00\x00\x01", After the hardware receives the data sent by Socket_send, will "drop" a sound, but the problem arises, a hardware is fine, but when more than one hardware connection and send data at the same time, there will be hardware can not be a continuous response (that is, the "drip" sound), that is, to send a continuous "drip" sound, it is not ringing , about a few seconds later, began to respond again, after a while, the hardware on several connections are like this, I have used non-blocking mode, or will do so, to find a solution, the following post code

PHP Code

   -->= $MAX _users) {$reject = ' Server full.                   
                Try again later.\n ";
                ///Place the current client connection as Socket_select select $connections [$i] = $newconn;               
                The input connection resource cache container $writefds [$i] = $newconn;
                The connection is not normal if ($reject) {$close [$i] = true;                  
                else {echo "Welcome to the PHP Chat server!\n";
                }//initializes the cache container for the current connection read content $input [$i] = "";
            Continue
            }//Client connection $i = (int) $rfd;
            Read $tmp = @socket_read ($RFD, Php_normal_read);
         if (! $tmp) {//Read content print "Connection closed on socket $i \ n";       Close ($i);
            Continue
            $input [$i]. = $tmp;
            $tmp = substr ($input [$i],-1);
                /*if ($tmp!= "\ r" && $tmp!= "\ n") {/no end of line, more data coming
            Continue
            }*/$line = Trim ($input [$i]);
            $input [$i] = ""; Echo ' Client >> '. $line. "
            
            
            
            
            \ r \ n ";
Socket_getpeername ($connections [$i],& $remoteIP,& $remotePort); echo $remoteIP. "
\ r \ n "; echo $remotePort. "
\ r \ n ";
$data =str_split ($buffer);
Print_r ($data);
 $str = "\xfa\x01\x01\xff\xaa\xaa\x00\x01\x00\x00\x00\x00\x00\x01";
            
            
            
            
            
            
        Socket_send ($connections [$i], $str, strlen ($STR), 0);
            foreach ($writefds as $wfd) {$i = (int) $wfd;
        $w = Socket_write ($wfd, "Hello"); }} function CloSE ($i) {Global $connections, $input, $close;
    Socket_shutdown ($connections [$i]);
    Socket_close ($connections [$i]);
    Unset ($connections [$i]);   
    Unset ($input [$i]);
Unset ($close [$i]);


 }?>