#27724 [NEW]: static variables do not behave like expected

From: leonel at nied dot unicamp dot br Operating system: Fedora Core1 PHP version: 5.0.0RC1 PHP Bug Type: Class/Object related Bug description: static variables do not behave like expected Description: ------------ I tried to implement a class with the Singleton pattern. However, static variables do not seem to tie to the class, but rather to the instance of the class. Looking at bug 16245 http://bugs.php.net/bug.php?id=16245&edit=2 I see that Mr. Flying and I have sort of 'exchanged' bugs. He got the result I expected and I got the result he expected. Notice 2 things: first, he assigned a primitive type to his variable, whereas my variable holds an object; second, his variable is declared inside the function, and mine is declared inside the class. Reproduce code: --------------- <?php class IntegerFactory { private static $int = NULL; function __construct() {} public function getInstance() { if ( !isset($this->int) ) { echo 'null !', "\n"; $this->int = new IntegerFactory; } return $this->int; } } $tmp1 = new IntegerFactory; $d1 = $tmp1->getInstance(); var_dump($d1); $tmp2 = new IntegerFactory; $d2 = $tmp2->getInstance(); var_dump($d2); $d3 = $tmp1->getInstance(); var_dump($d3); ?> Expected result: ---------------- null ! object(IntegerFactory)#2 (0) { } object(IntegerFactory)#2 (0) { } object(IntegerFactory)#2 (0) { } Actual result: -------------- null ! object(IntegerFactory)#2 (0) { } null ! object(IntegerFactory)#4 (0) { } object(IntegerFactory)#2 (0) { } -- Edit bug report at http://bugs.php.net/?id=27724&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27724&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27724&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=27724&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=27724&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=27724&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=27724&r=needscript Try newer version: http://bugs.php.net/fix.php?id=27724&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=27724&r=support Expected behavior: http://bugs.php.net/fix.php?id=27724&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=27724&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=27724&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=27724&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27724&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=27724&r=dst IIS Stability: http://bugs.php.net/fix.php?id=27724&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=27724&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=27724&r=float