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    <p>I'll answer it myselfe. I went over it line by line.. this is how it works (I'm only explaining the part in the while(true) loops.</p> <p>1.</p> <pre><code>// Setup clients listen socket for reading $read[0] = $sock; for ($i = 0; $i &lt; $max_clients; $i++) { if (isset($client[$i]['sock'])) $read[$i + 1] = $client[$i]['sock']; } </code></pre> <p>This asings freshly created connections to the $read array to be watched for incoming data.</p> <pre><code>// Set up a blocking call to socket_select() if (socket_select($read, $write = NULL, $except = NULL, $tv_sec = 5) &lt; 1) continue; </code></pre> <p>Watches the $read array for new data (I'm still a bit unclear how this works)</p> <pre><code>/* if a new connection is being made add it to the client array */ if (in_array($sock, $read)) { for ($i = 0; $i &lt; $max_clients; $i++) { if (empty($client[$i]['sock'])) { $client[$i]['sock'] = socket_accept($sock); echo "New client connected $i\r\n"; break; } elseif ($i == $max_clients - 1) echo "Too many clients...\r\n"; } } </code></pre> <p>Determines when a new connection is being made, than finds an empty spot in the $client array and add the socket.</p> <p>This next part I'll split up for easier explanation.</p> <pre><code>for ($i = 0; $i &lt; $max_clients; $i++) { // for each client if (isset($client[$i]['sock'])) { </code></pre> <p>Loops through all the $client array but only works on the ones that actually have a connection.</p> <pre><code>if (in_array($client[$i]['sock'], $read)) { $input = socket_read($client[$i]['sock'], 1024); if ($input == null) { echo "Client disconnecting $i\r\n"; // Zero length string meaning disconnected unset($client[$i]); } else { echo "New input received $i\r\n"; // send it to the other clients for ($j = 0; $j &lt; $max_clients; $j++) { if (isset($client[$j]['sock']) &amp;&amp; $j != $i) { echo "Writing '$input' to client $j\r\n"; socket_write($client[$j]['sock'], $input, strlen($input)); } } if ($input == 'exit') { // requested disconnect socket_close($client[$i]['sock']); } } } else { echo "Client disconnected $i\r\n"; // Close the socket socket_close($client[$i]['sock']); unset($client[$i]); } </code></pre> <p>First it sees if there is still an active connection, if not it closes it. If there is a connection it read the data, if there is noone this is code for a disconnect. If there is data it passes it along to other clients (but itselfe).</p> <p>That's ti. Hope I got it right.</p>
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