What are the common challenges in using Server Sent Events (SSE) in PHP for real-time updates on a website?

One common challenge in using Server Sent Events (SSE) in PHP for real-time updates on a website is ensuring that the connection remains open. This can be achieved by sending a comment to the client periodically to prevent the connection from timing out. 

<?php
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');

// Send a comment to the client every 30 seconds to keep the connection open
while (true) {
    echo ": keep-alive\n\n";
    flush();
    sleep(30);
}
?>

Keywords

Server Sent Events SSE PHP real-time updates challenges

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