Re: [PHP] Counting Online users, but not using a Session Table in MySQL
On 1/28/2011 11:23 AM, David Harkness wrote: > On Fri, Jan 28, 2011 at 11:03 AM, Marc Guay wrote: > >> If COUNTing is the heavy part, why not create a 'users_logged_in' >> field somewhere and increment it when someone logs in and decrement it >> when someone logs out? Then your query is just a straight SELECT. > > > If this is like most web sites, users don't usually log out--they just stop > requesting pages. With no logout event to decrement the count you need some > other way to stop counting a particular user such as 30 minutes after they > logged in. This is easily handled in a query on the users table, but it > causes performance issues. > > David > cron it. Setup a cron script that runs every 5 minutes. A seconds work every 5 minutes isn't too much is it? Jim Lucas -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Counting Online users, but not using a Session Table in MySQL
On Fri, Jan 28, 2011 at 11:03 AM, Marc Guay wrote: > If COUNTing is the heavy part, why not create a 'users_logged_in' > field somewhere and increment it when someone logs in and decrement it > when someone logs out? Then your query is just a straight SELECT. If this is like most web sites, users don't usually log out--they just stop requesting pages. With no logout event to decrement the count you need some other way to stop counting a particular user such as 30 minutes after they logged in. This is easily handled in a query on the users table, but it causes performance issues. David
Re: [PHP] Counting Online users, but not using a Session Table in MySQL
> I'm looking for a faster way to count online users. COUNT(*) is time > consuming under MySQL. If COUNTing is the heavy part, why not create a 'users_logged_in' field somewhere and increment it when someone logs in and decrement it when someone logs out? Then your query is just a straight SELECT. Just chucking a thought out there. Marc -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Counting Online users, but not using a Session Table in MySQL
If you're using memcached already you could store the number in it and update it only when a user logs in/out. If no one is logging in/out, the number isn't changing. If your site is so popular that hundreds of users are logging in every second you might want to change the logic so that the process to update the count only does so when it has expired from the cache and give it a short expiry time. At that point you probably would want each machine to track its own number to avoid frequent distribution costs. In the end I think you're going to have to get comfortable with the idea that the number will never be exact. If you want exact, you have to pay for it. David
Re: [PHP] Counting Online users, but not using a Session Table in MySQL
Jim, I'm already using the solution you mentioned. The problem is about the performance. One solution is to increase the performance by using Memcached. But counting online users always requires a __new__fresh__ COUNT(*) query, even under Memcahched. Since the COUNT(*) result is very dynamic and could change every second, it should not be cached. I'm looking for a faster way to count online users. COUNT(*) is time consuming under MySQL. Any light-weight solutions? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] "public static" or "static public"?
On Fri, Jan 28, 2011 at 10:35 AM, Mujtaba Arshad wrote: > Having learned java before even knowing what php was (yeah I'm a noob in > both) I prefer scope static function. I learned Java first, too, and also prefer the scope first. I place a scope on every method, so I'd rather the first word always be the scope rather than sometimes scope, sometimes static. I also think of it as a "static function" that happens to be "public." Finally, I prefer to group static members at the top of the class to differentiate them as a separate API for the class itself.
Re: [PHP] "public static" or "static public"?
Having learned java before even knowing what php was (yeah I'm a noob in
both) I prefer scope static function.
On Fri, Jan 28, 2011 at 12:20 PM, Fernando wrote:
> I personally like scope static fucntion. Coming from C# it just makes more
> sense to me.
>
> JF.
>
>
> On 28/01/2011 12:15, Colin Guthrie wrote:
>
>> OK, so it's a Friday hence a random debate
>>
>>
>> What is preferred for class methods?
>>
>> class foo
>> {
>> static public function bar(){}
>>
>> public static function wibble(){}
>> }
>>
>> ??
>>
>> All methods are valid, but are some more valid than others? :p
>>
>> Checking ZF:
>>
>> [colin@jimmy Zend (working)]$ cgrep "public static function" . |wc -l
>> 755
>> [colin@jimmy Zend (working)]$ cgrep "static public function" . |wc -l
>> 60
>>
>> It's clear which is preferred there, but still not absolutely consistent
>> (I didn't bother checking differently scoped methods).
>>
>>
>> I personally prefer scope first then "static", but others may have valid
>> reasons/arguments for preferring the other way.
>>
>> WDYT?
>>
>> Col
>>
>>
>>
>>
--
Mujtaba
Re: [PHP] String Encodings - loose guidelines
Marc Guay wrote: 1.) Saving strings to a database One thing I always forget to remember is to send tge "SET NAMES utf8" command to MySQL after making a connection. This will save you 1000 headaches if you're working with non-latin characters. I can't count the number of times I've thrown htmlentities, htmlspecialchars, utf8_encode/decode/, stripslashes, etc, etc around trying to figure out why those É's aren't being saved or read properly. I imagine this might fall into the category of "best practice". Marc Thanks for the heads up! Donovan -- D Brooke -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Counting Online users, but not using a Session Table in MySQL
On 1/28/2011 9:57 AM, AmirBehzad Eslami wrote: > Dear list, > > The common solution for counting online users is to store sessions in a Table. > I've created a Table in MySQL to acheive the result, but it seems this > solution > is a little heavy for such a simple task. > > Is there a better alternative? Can I use SqlLite to make COUNT(*) queries > based > on a where statement? > > Is there any better solution? Do you know any way to store sessions in Memory? > > Does Memcache support counting sessions? > > I'm looking for a high-performance solution to count online users. > What do you think? > The simple way that we do it is to have users table have a boolean field that gets updated when a person logs in, then a time field showing when they last visited. These together should give you the information that you are looking for. This gives you the idea... SELECT COUNT(*) FROMusers_table WHERE logged_in = 't' AND last_activity > FROM_UNIXTIME( UNIX_TIMESTAMP() - 1800 ) Jim Lucas -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Counting Online users, but not using a Session Table in MySQL
How did you created the table? Can you count the Id's only? Wouldn't this just count the entries in the index? On 28/01/2011 12:57, AmirBehzad Eslami wrote: Dear list, The common solution for counting online users is to store sessions in a Table. I've created a Table in MySQL to acheive the result, but it seems this solution is a little heavy for such a simple task. Is there a better alternative? Can I use SqlLite to make COUNT(*) queries based on a where statement? Is there any better solution? Do you know any way to store sessions in Memory? Does Memcache support counting sessions? I'm looking for a high-performance solution to count online users. What do you think?
Re: [PHP] "public static" or "static public"?
I personally like scope static fucntion. Coming from C# it just makes
more sense to me.
JF.
On 28/01/2011 12:15, Colin Guthrie wrote:
OK, so it's a Friday hence a random debate
What is preferred for class methods?
class foo
{
static public function bar(){}
public static function wibble(){}
}
??
All methods are valid, but are some more valid than others? :p
Checking ZF:
[colin@jimmy Zend (working)]$ cgrep "public static function" . |wc -l
755
[colin@jimmy Zend (working)]$ cgrep "static public function" . |wc -l
60
It's clear which is preferred there, but still not absolutely consistent
(I didn't bother checking differently scoped methods).
I personally prefer scope first then "static", but others may have valid
reasons/arguments for preferring the other way.
WDYT?
Col
[PHP] "public static" or "static public"?
OK, so it's a Friday hence a random debate
What is preferred for class methods?
class foo
{
static public function bar(){}
public static function wibble(){}
}
??
All methods are valid, but are some more valid than others? :p
Checking ZF:
[colin@jimmy Zend (working)]$ cgrep "public static function" . |wc -l
755
[colin@jimmy Zend (working)]$ cgrep "static public function" . |wc -l
60
It's clear which is preferred there, but still not absolutely consistent
(I didn't bother checking differently scoped methods).
I personally prefer scope first then "static", but others may have valid
reasons/arguments for preferring the other way.
WDYT?
Col
--
Colin Guthrie
gmane(at)colin.guthr.ie
http://colin.guthr.ie/
Day Job:
Tribalogic Limited [http://www.tribalogic.net/]
Open Source:
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Re: [PHP] Pear Problems
On Fri, Jan 28, 2011 at 00:33, Ethan Rosenberg wrote: > > Please take a look at php.ini in the vicinity of line 510. You will see the > construct to which I refer. Can you explain what is going on? I do not > think it is a problem with commenting out a line. > > Any ideas from the rest of the list? Keep in mind that php.ini is not universal, and changes drastically with version, distribution, CLI vs. web, customization, and more. The answer that Adam gave you is absolutely correct with regard to the information you provided. You need to put a semicolon before the line you quoted as being line 510 in your php.ini. The directive you want is error_reporting, and should look like so: error_reporting = E_ALL & ~E_NOTICE -- Network Infrastructure Manager Documentation, Webmaster Teams http://www.php.net/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
