PHP WebSocket – How send message to specified client? -

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sending messages clients looks this:

function send_message($msg) {     global $clients;     foreach($clients $changed_socket)     {         socket_write($changed_socket, $msg, strlen($msg));     }     return true; }

how can send message specified client, example client #2? $clients array looks this:

array (    [0]    [1]    [2]    [3] )

instead of running foreach loop send messages every client, send 1 want. 

function send_message($msg) {     global $clients;     socket_write($clients[2], $msg, strlen($msg));     return true; }

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