PHP web socket unable to bind socket

Question

I have a apache server and listen to port 8000 and 80

i use below php function to create a web socket

private function createSocket($host,$port)
{
    if( ($this->master=socket_create(AF_INET,SOCK_STREAM,SOL_TCP)) < 0 )
    {
        die("socket_create() failed, reason: ".socket_strerror($this->master));
    }

    self::console("Socket {$this->master} created.");

    socket_set_option($this->master,SOL_SOCKET,SO_REUSEADDR,1);
    #socket_set_option($master,SOL_SOCKET,SO_KEEPALIVE,1);

    if( ($ret=socket_bind($this->master,$host,$port)) < 0 )
    {
        die("socket_bind() failed, reason: ".socket_strerror($ret));
    }

    self::console("Socket bound to {$host}:{$port}.");

    if( ($ret=socket_listen($this->master,5)) < 0 )
    {
        die("socket_listen() failed, reason: ".socket_strerror($ret));
    }

    self::console('Start listening on Socket.');

    $this->allsockets[] = $this->master;
}

assume the $host is 127.0.0.1 and $port is 8000

when i go to shell console and start the socket server, it said Warning: socket_bind(): unable to bind address [98]: Address already in use

when i remove the $port, it doesnt show error, but the socket server keep listening and no response

What is the problem?

MrCode · Accepted Answer · 2012-12-04 08:04:55Z

1

Warning: socket_bind(): unable to bind address [98]: Address already in use

This means that your server is already using the port that you selected. You'll have to choose another port until you find one that is not in use.

answered Dec 4, 2012 at 8:04

MrCode

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12 Comments

user192344 Over a year ago

i try, 1234, 1235,1236,8000,8001, 8002, but same msg

MrCode Over a year ago

Those are likely in use as well, the lower numbers are typically used first. Try ports above 40000.

user192344 Over a year ago

try 41234, and viewed to current listen port, there is no listen state on 41234, but return the same msg, even restart server

csl Over a year ago

You can easily check if a port is in use by doing telnet 127.0.0.1 1234 for port number 1234. If you get a connection, it's in use.

MrCode Over a year ago

It's saying 41234 is in use too?

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