It will use up CPU time and bandwidth, yes. It should take less
bandwidth than the "refresh constantly" version, but only if you code
it right.
You could also write a little JS to pull some content from the server
(get messages after a certain time / message id) and inject them into
the page. This is really the best solution if you want to stay in the
browser and not do Flash or Java.
On Thu, 24 Jun 2004 17:24:31 -0500, Stephen Craton
<[EMAIL PROTECTED]> wrote:
>
> Thanks for all the help here.
>
> The only question I have left is bandwidth. Would a while(true) { } loop hog
> up enormous ammounts of bandwidth or just sit there quietly bugging noone?
> The only other option I have going for me is the iframe hack, which I'm
> getting annoyed of...
>
> Thanks,
> Stephen Craton
> http://www.melchior.us
>
> -----Original Message-----
> From: Justin Patrin [mailto:[EMAIL PROTECTED]
> Sent: Thursday, June 24, 2004 5:01 PM
> To: Stephen Craton
> Cc: PHP List
> Subject: Re: [PHP] Streaming
>
> Your script is ending, so the page ends. PHP (HTTP) isn't really supposed to
> do "streaming." If you want it to "stream" you have to keep the script
> running. Add something like this:
>
> while(true) {
> while($db->next_record()) {
> echo '<b>'.$db->Record["user"].':</b> ';
> $sql = "SELECT emote, image FROM c_emotes";
> $result = mysql_query($sql, $db->linkid);
> while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
> $emotes[] = $row['emote'];
> $images[] = "<img src='".$row['image']."'>";
> }
> if($db->Record['system'] != 1) {
> $message = htmlentities($db->Record["text"]);
> } else {
> $message = $db->Record["text"];
> }
> $message = str_replace($emotes, $images, $message);
> echo $message."<br>\n";
> flush();
> }
> sleep(5);
> set_time_limit(30);
> }
>
> This will actually run *forever* and will loop through the records again and
> again, probably giving yu the same content as before. You would need some
> kind of way to know which records are "new" so you can only display them in
> the loop. I would suggest adding a "time > $savedTime" or some such to the
> loop.
>
> Please note, though, that this is a *very large hack*. You're not supposed
> to keep your scripts running forever. If you really want to "stream", write
> a Java/C/C++/C#/etc. app. Or, if you're feeling adventurous, use JavaScript.
>
> On Thu, 24 Jun 2004 16:54:57 -0500, Stephen Craton <[EMAIL PROTECTED]>
> wrote:
> >
> > I just put it into my script, and it doesn't seem to be working. I put
> > ob_end_clean(); at the top of the script, but here's the while loop I
> have:
> >
> > while($db->next_record()):
> > echo '<b>'.$db->Record["user"].':</b> ';
> > $sql = "SELECT emote, image FROM c_emotes";
> > $result = mysql_query($sql, $db->linkid);
> > while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
> > $emotes[] = $row['emote'];
> > $images[] = "<img src='".$row['image']."'>";
> > }
> > if($db->Record['system'] != 1) {
> > $message = htmlentities($db->Record["text"]);
> > } else {
> > $message = $db->Record["text"];
> > }
> > $message = str_replace($emotes, $images, $message);
> > echo $message."<br>\n";
> > flush();
> > endwhile;
> >
> > It displays just fine if you refresh, but unless you refresh, you
> > don't see any new data. Any ideas?
> >
> > Thanks,
> > Stephen Craton
> > http://www.melchior.us
> >
> >
> >
> > -----Original Message-----
> > From: Justin Patrin [mailto:[EMAIL PROTECTED]
> > Sent: Thursday, June 24, 2004 4:47 PM
> > To: Stephen Craton
> > Cc: PHP List
> > Subject: Re: [PHP] Streaming
> >
> > ob_end_clean() goes at the top.
> > flush() goes after *every* pice of info you want to show real-time.
> > Basically, after every echo or group of echos.
> >
> > On Thu, 24 Jun 2004 16:43:39 -0500, Stephen Craton
> > <[EMAIL PROTECTED]>
> > wrote:
> > >
> > > Thanks for this, but how do I use it? Do I just put the
> > > ob_end_clean() at the opening the page I want to stream and then put
> flush() at the end?
> > >
> > > Thanks,
> > > Stephen Craton
> > > http://www.melchior.us
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: svk [mailto:[EMAIL PROTECTED]
> > > Sent: Thursday, June 24, 2004 4:25 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: [PHP] Streaming
> > >
> > > On Thu, 2004-06-24 at 16:41, Stephenpp
> > >
> > > To use "streaming", you have to :
> > > Turn off output buffering: ob_end_clean() and flush the output has
> > > it comes
> > > : flush()
> > >
> > > It is useful to note that :
> > > "Some versions of Microsoft Internet Explorer will only start to
> > > display the page after they have received 256 bytes of output, so
> > > you may need to send extra whitespace before flushing to get those
> > > browsers to
> > display the page.
> > > "
> > >
> > > and
> > > "Pad your output with necessary spaces, wrap your progressing data
> > > around open (<table>) and end (</table>) tags, and then call flush()
> > > so that one script will work for Netscape as well.
> > > "
> > >
> > > > I was browsing the net and I found a PHP chat script that claimed
> > > > that it does not refresh, rather it has "streaming text". This got
> > > > my interest and was wondering how the script did it. I downloaded
> > > > it's source code but couldn't find anything useful in it, very
> > > > hard to read in my opinion. I did a search on PHP.net for
> > > > streaming but I couldn't understand much of that, just my noobishness
> I suppose.
> > > >
> > > > How exactly would you go about streaming in PHP anyway? This has
> > > > my interest now...
> > > >
> > > > Thanks,
> > > > Stephen Craton
> > > > http://www.melchior.us <http://www.melchior.us/>
> > > >
> > >
> > > --
> > > PHP General Mailing List (http://www.php.net/) To unsubscribe, visit:
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> > >
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> > >
> > >
> > >
> > >
> > >
> >
> >
> > --
> > paperCrane --Justin Patrin--
> >
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> >
> >
> >
> >
> >
>
> --
> paperCrane --Justin Patrin--
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>
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