sleep not working inside php IF statement

Question

I have a simple code in PHP that after move a uploaded file, need to print some information, but the problem is, I have a Sleep() inside the IF statement, and all the text before and after the sleep just show when the sleep count end.

Code below:

if(move_uploaded_file($_FILES['uploadvideo']['tmp_name'],$target_path))
{
echo "<pre>";
echo "Your video ".$cname." has been successfully uploaded<br>";
echo sha1_file($target_path)."<br>";
echo md5_file($target_path)."<br>";
ob_end_flush();
flush();
sleep(2);
echo "Please check if your file is good";
echo "</pre>";
}

If I put the flush, and sleep outside the IF everything works good.

The question is the Sleep() statement can be inserted inside a IF?

Thanks!

@VermaJr. No it's runs normally, and the execution time is set to 180 seconds. — Paul Mark, Oct 01 '19 at 02:38
Why use sleep? It's not needed for what you are trying to do? — Bram Verstraten, Oct 01 '19 at 07:10
@BramVerstraten I need the sleep because I would like the the text be printed some time after the before — Paul Mark, Oct 02 '19 at 01:21
You might be able to make this work if you flush correctly, do some header sorcery and disable compression. Take a look at this: https://stackoverflow.com/questions/138374/how-do-i-close-a-connection-early — istepaniuk, Oct 02 '19 at 11:30

score 1 · Answer 1 · answered Oct 02 '19 at 08:28

sleep() works fine. But it cannot help you achieve your goal.

flush() cannot force sending the content you generate before sleep() back to the client (the browser). All it does is to push it down the line. But it cannot control what happens with the text when it exits the interpreter. The web server can cache the content and send it together with the rest of the content when the script ends. And, sometimes, the browser itself doesn't render a piece of text until it receives it completely.

It is explained in the documentation of flush().

You can use JavaScript and AJAX to achieve the effect you want (and, in fact, to implement it correctly).

score 0 · Answer 2 · answered Oct 02 '19 at 08:20

You need to specify charset

header('Content-type: text/html; charset=utf-8');

and it still might not work. Try flushing after every echo statement, and even then not every one might get flushed. Flushing output buffer only sends the data to output, it is not guaranteed to send it to the browser.

sleep not working inside php IF statement

2 Answers2