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Article Discussion: The Quickest Way To Count Users Online With PHP

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  #1  
Old October 4th, 2002, 08:40 PM
mytch mytch is offline
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Article Discussion: The Quickest Way To Count Users Online With PHP
The Quickest Way To Count Users Online With PHP If you have any comments or questions about this article then please post them here.

You can read the article here .
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  #2  
Old October 4th, 2002, 10:06 PM
Adman Adman is offline
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I would suggest using if(is_file($Fil)) instead of the method in the article becuase the way shown, I have add some errors. Over all the I thought the article was great!
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  #3  
Old October 6th, 2002, 11:13 PM
sicksand sicksand is offline
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got Error
greeting,

got some errors

my getOnlineUsers.php
PHP Code:
<?
session_save_path("E:\\homepage\\shapik\\vthree.0\\sessions");
/* Start the session */
session_start();

/* Define how long the maximum amount of time the session can be inactive. */
define("MAX_IDLE_TIME", 3);

function getOnlineUsers(){

if ( $directory_handle = opendir( session_save_path() ) ) {
$count = 0;
while ( false !== ( $file = readdir( $directory_handle ) ) ) {
if($file != '.' && $file != '..'){
// Comment the 'if(...){' and '}' lines if you get a significant amount of traffic
if(time()- fileatime(session_save_path() . '\\' . $file) < MAX_IDLE_TIME * 60) {
$count++;
}
}
closedir($directory_handle);

return $count;

} else {
return false;
}

}

echo 'Number of online users: ' . getOnlineUsers() . '<br />'; 
?>


my index.php
PHP Code:
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<?php

include('getOnlineUsers.php');

echo 'There are ' . getOnlineUsers() . ' user(s) currently browsing MyDomain.com';

?>

</body>
</html> 
Last edited by sicksand : October 6th, 2002 at 11:27 PM.
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  #4  
Old October 6th, 2002, 11:17 PM
FrankieShakes FrankieShakes is offline
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What error messages are you receiving?
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  #5  
Old October 7th, 2002, 12:00 AM
sicksand sicksand is offline
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Parse error: parse error, unexpected T_ELSE in e:\homepage\shapik\vthree.0\getOnlineUsers.php on line 24

Fatal error: Call to undefined function: getonlineusers() in e:\homepage\shapik\vthree.0\index.php on line 12
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  #6  
Old October 7th, 2002, 11:01 PM
FrankieShakes FrankieShakes is offline
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You're missing a closing brace "}" in your getOnlineUsers() function. I would suggest indenting your code, this way you can find errors like this more easily. It provides easier readability.

Try that.
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  #7  
Old October 11th, 2002, 08:44 PM
tab tab is offline
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hey everbody! i'm new here and i was testing this script out and aready solved the missing bracket problem, but now i run into a new problem and where it supposed to say "users online: "
it says

Warning: open_basedir restriction in effect. File is in wrong directory in /mnt/host-users/cumnut/index.php on line 10
users online:

any help?
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  #8  
Old October 11th, 2002, 09:08 PM
Ben Rowe
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this means that your having problems with setting the session data i think?? does your server allow sessions to be used?
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  #9  
Old October 11th, 2002, 09:23 PM
tab tab is offline
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how do i find out if my server allows sessions?
i tried using phpinfo()

and said phpinfo() was dispabled for security reasons...
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  #10  
Old October 11th, 2002, 09:51 PM
Ben Rowe
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sounds like its running in safe mode maybe?
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  #11  
Old October 11th, 2002, 09:54 PM
tab tab is offline
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is their any way i can change that?
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  #12  
Old October 11th, 2002, 10:20 PM
Ben Rowe
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well that depends if you have administrator rights to the actual web server? If your using a hosted web server, your got bugger all chance.

However, things will lookup if your running your own server

look for "safe_mode" (without the quotes) in your php.ini file, and make sure that its set to "Off" (again without the quotes)

save it, and restart the server.
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  #13  
Old October 12th, 2002, 03:07 PM
tab tab is offline
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i'm hosted!! well, worth a try anywayz....
maybe i'll change the host...
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  #14  
Old November 3rd, 2002, 06:11 PM
Fabio Heller Fabio Heller is offline
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Hi, first of all I'm sorry for my poor English.
The method described in the article is as great as simple but I would never suggest anybody to save sessions in files in a very busy site. In this case, as far as I know, it would be better saving sessions in dbm files or in a database.
Have you ever tried, by any chance, to use your method on a dbm files based session system and count the keys instead of files?
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  #15  
Old February 20th, 2003, 08:19 AM
Mezza Mezza is offline
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Hey, dont know if anyone else has run into this problem, but fileatime() does not return the access TIME of the files on a Windows platform, only the date.

Not sure if there is a work around for this.

Any ideas?

I have already edited the script some what to only count session files that have certain values within them, so as to only count session files of registered members

goes like this :


PHP Code:
 session_start(); 
define("MAX_IDLE_TIME", 3); 

function getOnlineUsers(){ 

if ( $directory_handle = opendir( session_save_path() ) ) { 
$count = 0; 
while ( false !== ( $file = readdir( $directory_handle ) ) ) {

if($file != '.' && $file != '..'){ 
$readfile = session_save_path() . $file;
echo fileatime($readfile);
$fr = file_get_contents($readfile);
if(strstr("$fr", "s_username")) {
$count++; 

} } } 
closedir($directory_handle); 
return $count; 

} else { 
return false; 
} 
}

echo 'Number of registered users online: ' . getOnlineUsers() . '<br />'; 


Wonder if adding a "last accessed date" to the session everytime it is accessed then pulling it out with any other values as above would solve this problem, or if it would slow everything down.

Any help welcome.

Thanks
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  #16  
Old February 20th, 2003, 08:39 AM
Mezza Mezza is offline
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lol..

Nevermind, created a work around.

Just incase anyone else needs it...

everytime you start the session:

PHP Code:
 session_start();
$_SESSION["lastaccess"] = time(); 


then the script itself:

PHP Code:
 session_start(); 
define("MAX_IDLE_TIME", 3); 

function getOnlineUsers(){ 

if ( $directory_handle = opendir( session_save_path() ) ) { 
$count = 0; 
while ( false !== ( $file = readdir( $directory_handle ) ) ) {
if($file != '.' && $file != '..'){ 
$readfile = session_save_path() . $file;
$fr = file_get_contents($readfile);
list($lastaccessstr) = explode(";",$fr);
list($lastr,$lastaccess) = explode(":",$lastaccessstr);
if(time()- $lastaccess < MAX_IDLE_TIME * 60) {
if(