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[2005-04-26 14:37 UTC] wagner at bonn dot edu
Description: ------------ Returning a value of an array or a member-variable causes the return to be by reference. This also happens in PHP 4.3.x Related to http://bugs.php.net/bug.php?id=32789 which seems bogusified beyond repair. Reproduce code: --------------- function incr(&$int) { return $int++; } function f() { static $v; if (!$v) $v = 1; return($v); } function f2() { static $v; if (!$v) { $v = array(); $v[0] = 1; } return($v[0]); } echo "f1: ".incr(f()).incr(f())."\n"; echo "f2: ".incr(f2()).incr(f2())."\n"; Expected result: ---------------- f1: 11 f2: 12 Same behaviour for both functions. Actual result: -------------- f1: 11 f2: 12 f2 inexplicably returns a reference. The manual states that for this to happen, it should be necessary to actually use a & in front of the definition of the returning function: http://de2.php.net/manual/en/language.references.return.php "... you have to use & in both places - to indicate that you return by-reference, not a copy as usual, and to indicate that reference binding, rather than usual assignment, should be done ..." PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Fri Jul 04 06:01:38 2025 UTC |
So static is implemented through references. Big deal. What does that have to do with this bug? Why does only one of the two functions in the example return a reference, although both use a static variable? The problem can be reproduced without static or global anyway: Reproduce code: --------------- function incr(&$int) { return $int++; } function f(&$v) { $cache = $v[0]; return($cache); } $v = array(); $v[0] = 1; echo "f: ".incr(f($v)).incr(f($v))."\n"; Expected result: ---------------- f: 11 return by value, no effect on $v Actual result: -------------- f: 12 return by reference ------------ How does incr() get its hands on $v here? f() should return a copy of $cache, which should be a copy too. This is apparently not a problem with static, but with how array (and object) are implemented in the ZE, and I find no mention whatsoever in the manual about that, so this is at least a documentation problem. Would you please take a good look at what I'm trying to explain here and reopen the bug?