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    <p>here is a simple Server Sent Event Script using php.</p> <p>support </p> <p><a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/API/EventSource</a></p> <p>js</p> <pre><code>var sse=new EventSource("sse.php"); sse.onmessage=function(e){ document.body.innerHTML=e.data; }; </code></pre> <p>sse.php</p> <pre><code>header('Content-Type: text/event-stream'); // specific sse mimetype header('Cache-Control: no-cache'); // no cache while(true) { if(/*something changes*/){ echo "id: ".time().PHP_EOL; echo "data: ".$data.PHP_EOL; echo PHP_EOL; } ob_flush(); // clear memory flush(); // clear memory sleep(10);// seconds } </code></pre> <p>this keeps the connection open with the client, </p> <p>then it checks if something is changed ... db/file whatever</p> <p>outputs the data if changed </p> <p>and then clears the php cache </p> <p>waits 10 seconds and does it again.</p> <hr> <p>As you can see the client recieves the data only if something changes on the server</p> <p>but i totally don't know how the server could handle 1000's of people.</p> <hr> <p>node.js would be a better way. but it depends what languages you are using and/or if you can actually use node.js.</p> <p>websockets is both ways.</p> <p>server sent event is oneway.(you need this)</p> <p><strong>EDIT</strong></p> <p>more data inside the sse response:</p> <p>js</p> <pre><code>var sse=new EventSource("sse.php"); sse.onmessage=function(e){ console.log(JSON.parse(e.data)) }; </code></pre> <p>sse.php</p> <pre><code>header('Content-Type: text/event-stream'); // specific sse mimetype header('Cache-Control: no-cache'); // no cache while(true) { if(/*something changes*/){ echo "id: ".time().PHP_EOL; $dataArray=array('id'=&gt;$id,'name'=&gt;$name,'more'=&gt;$more); echo "data: ".json_encode($dataArray).PHP_EOL; echo PHP_EOL; } ob_flush(); // clear memory flush(); // clear memory sleep(10);// seconds } </code></pre> <p>if you need some more info just ask</p>
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    1. POWeb Page update without polling
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    1. UScocco
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    1. COAs you mentioned above that it waits 10 secs to repeat the process again, so do you really think Server Sent Events will be a solution? I don't know if i am asking a good question.
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      1. USnurakantech
    2. COsse is made for what you are asking for. but php isn't made to stream data. the solition is for sure better then polling. by changing the sleep(10) to sleep(3) it repeats the process every 3 sec..
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    3. COI am going to try SSE for sure and websockets as well. One more question, what if remove the sleep() function from the php script and also what if i need to send some parameters(like user id or something) when i make a call to the script?
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