Description:
------------
Hi

I have problem in singleton object creation. I having Apache and PHP 5.2.5
Below is the singleton code.
========== CODE =============== 
POSTED HERE
========== CODE ===============

Problem:

i have opened a new browser and triggered this class, for the first time the result 
is fine, ie output was 
Intializing ....

Now for the second time when i refreshed the page agiain it is displaying the same output, it is not entering the else part in the "static function getInstance() ".

Also i have opened another browser at the same time , and again trigger this class , and also i am getting same dam.. output..

=== Doubts============

1) will PHP create a singleton object for per session or for entire engine (like singleton object in java for entire JVM).

2) if the singleton object is for entire engine , why it is getting initialized when i triggered the same class from some other browser,(ie) it should not echo "initializing ..." , it should echo "Already init ()".
=== Doubts============

Please describe me what is happening here.

Regards
waxtonmax 


Reproduce code:
---------------
<?php

class Logger {

static private $singleton;

private function __construct() {

}


private function __clone() {

}

static function getInstance() {

echo " ENTERING FOR GET INSTANCE.."."<br>";

if(Logger::$singleton == null) {

echo "Intializing ...."."<br>";;
Logger::$singleton = new Logger();

} else {

echo " Already init ()"."<br>";;
}

return Logger::$singleton;

}

/**
* 
*/
public function logWriter($serverity , $errMsg) {

// DO SOME THING 
}
}

Logger::getInstance()->logWriter(1, "This is the file content" );
?>


Expected result:
----------------
Same instance should used across all the session.

ie where new request come from different user, the same instance which is instantiated first should be used

Actual result:
--------------
But new instance is created for every new request for the same session .