Combining php stream sockets with eventSource - php

Question

I am trying to learn about sockets in PHP and lots of reading has brought me down the route of stream_socket_server().
I got a basic chat working between two terminals in linux using code similar to what is below and was hoping my next step would be to build a chat or a notification system on the web.
What I expected to happen:
The event listener in eventSource.html would listen for an event in the while loop and output the message received from a linux terminal that was running server.php
What is happening:
Everything from the point of view of eventSource.html is working as it should. So if I was to take away the entire purpose of this and just replace the message with a standard string Hello World then this succesfully outputs <li>message:{Hello World}</li> every second.
However once I try and read data from the terminal nothing is appearing except <li>message: {}</li> every second. It is worth noting that when I run server.php it waits for the client, and when I then run eventSource.html it sucessfully connects.
I am misunderstanding how this works? I assumed that every second in the while loop it would look out for data in that stream.
Or am I going down a completely wrong road in terms of learning sockets.
server.php (I load this from the terminal in linux)
<?php
$PORT = 20226; //chat port
$ADDRESS = "localhost"; //adress
$ssock; //server socket
$csock; //chat socket
$uin; //user input file descriptor
$ssock = stream_socket_server("tcp://$ADDRESS:$PORT"); //creating the server sock
echo "Waiting for client...\n";
$csock = stream_socket_accept($ssock); //waiting for the client to connect
//$csock will be used as the chat socket
echo "Connection established\n";
$uin = fopen("php://stdin", "r"); //opening a standart input file stream
$conOpen = true; //we run the read loop until other side closes connection
while($conOpen) { //the read loop
$r = array($csock, $uin); //file streams to select from
$w = NULL; //no streams to write to
$e = NULL; //no special stuff handling
$t = NULL; //no timeout for waiting
if(0 < stream_select($r, $w, $e, $t)) { //if select didn't throw an error
foreach($r as $i => $fd) { //checking every socket in list to see who's ready
if($fd == $uin) { //the stdin is ready for reading
$text = fgets($uin);
fwrite($csock, $text);
}
else { //the socket is ready for reading
$text = fgets($csock);
if($text == "") { //a 0 length string is read -> connection closed
echo "Connection closed by peer\n";
$conOpen = false;
fclose($csock);
break;
}
echo "[Client says] " .$text;
}
}
}
}
client.php gets loaded from eventSource.html below
<?php
date_default_timezone_set("America/New_York");
header("Content-Type: text/event-stream\n\n");
$PORT = 20226; //chat port
$ADDRESS = "localhost"; //adress
$sock = stream_socket_client("tcp://$ADDRESS:$PORT");
$uin = fopen("php://stdin", "r");
while (1) {
$text = fgets($uin);
echo 'data: {'.$text.'}';
echo "\n\n";
ob_end_flush();
flush();
sleep(1);
}
eventSource.html
<script>
var evtSource = new EventSource("client.php");
evtSource.onmessage = function(e) {
var newElement = document.createElement("li");
newElement.innerHTML = "message: " + e.data;
var div = document.getElementById('events');
div.appendChild(newElement);
}
</script>
<div id="events">
</div>