From: [EMAIL PROTECTED]
Operating system:
PHP version: 4.2.3
PHP Bug Type: Scripting Engine problem
Bug description: lost of static reference between calls
I want to keep a reference on a global object in a static method. But,
between calls of this static method, my reference becomes NULL !
Look at this simple self-explanatory code:
------------------------------------------------
class B {
var $x=100;
}
class A {
/*Returns an instance*/
function &getInstance(){
if( !isset($GLOBALS['foo']) ){
$GLOBALS['foo'] =& new B();
}
return $GLOBALS['foo'];
}
}
/*this function gets the instance and show information*/
function staticExecution(){
static $instance=NULL;
echo "ENTER staticExecution". "<BR/>\n";
//If static variable is not initialized
if( $instance === NULL ){
$instance =& A::getInstance();
echo "DEBUG: getInstance is called". "<BR/>\n";;
}
echo 'BEFORE INCREMENT:$instance->x=='.$instance->x."<BR/>\n";
$instance->x++;
echo 'AFTER INCREMENT: $instance->x == '.$instance->x . "<BR/>\n";
echo "EXIT staticExecution". "<BR/>\n";;
}
//ten call to staticExecution
for ($i=0; $i<10; $i++){
staticExecution();
echo "<HR/>";
}
RESULTS:
------------------------------------------------
ENTER staticExecution
DEBUG: getInstance is called
BEFORE INCREMENT: $instance->x == 100
AFTER INCREMENT: $instance->x == 101
EXIT staticExecution
------------------------------------------------------------ENTER
staticExecution
DEBUG: getInstance is called
BEFORE INCREMENT: $instance->x == 101
AFTER INCREMENT: $instance->x == 102
EXIT staticExecution
------------------------------------------------------------ENTER
staticExecution
DEBUG: getInstance is called
BEFORE INCREMENT: $instance->x == 102
AFTER INCREMENT: $instance->x == 103
EXIT staticExecution
------------------------------------------------------------ENTER
staticExecution
DEBUG: getInstance is called
BEFORE INCREMENT: $instance->x == 103
AFTER INCREMENT: $instance->x == 104
EXIT staticExecution
------------------------------------------------------------
LIKE THIS TEN TIMES;
WHAT DO WE NOTICE:
- the reference returned is good: x is incremented
- BUT the debug message appears 10 times !!! Indeed, my static variable is
reinitialized between calls
--
Edit bug report at http://bugs.php.net/?id=21128&edit=1
--
Try a CVS snapshot: http://bugs.php.net/fix.php?id=21128&r=trysnapshot
Fixed in CVS: http://bugs.php.net/fix.php?id=21128&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=21128&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=21128&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=21128&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=21128&r=support
Expected behavior: http://bugs.php.net/fix.php?id=21128&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=21128&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=21128&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=21128&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=21128&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=21128&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=21128&r=isapi
