#29428 [NEW]: Error or missing overview of unset() function

From: kingoleg at mail dot ru Operating system: All PHP version: Irrelevant PHP Bug Type: Documentation problem Bug description: Error or missing overview of unset() function Description: ------------ In http://ua2.php.net/unset nothing said about how work unset() on local variables (PASSED BY REFERENCE or NOT). unset() always "destroy" variables in local area. See code 1. May be would be good to write, that for variable PASSED BY REFERENCE we can use operation = null to unset variable. See code 2. Reproduce code: --------------- <?php function a() { $foo = 'ok'; b($foo); var_dump($foo); } function b(&$foo) { $foo = 'not ok'; unset($foo); } a(); ?> <?php function a() { $foo = 'ok'; b($foo); var_dump($foo); } function b(&$foo) { $foo = 'not ok'; $foo=null; } a(); var_dump($b); ?> Expected result: ---------------- For code 1. One of tree: 1. 'ok' 2. 'not ok' 3. variable $foo is null (not setted) For code 2. NULL NULL Actual result: -------------- 'not ok' NULL NULL -- Edit bug report at http://bugs.php.net/?id=29428&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=29428&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=29428&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=29428&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=29428&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=29428&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=29428&r=needscript Try newer version: http://bugs.php.net/fix.php?id=29428&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=29428&r=support Expected behavior: http://bugs.php.net/fix.php?id=29428&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=29428&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=29428&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=29428&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=29428&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=29428&r=dst IIS Stability: http://bugs.php.net/fix.php?id=29428&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=29428&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=29428&r=float