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[2006-09-12 12:18 UTC] j dot henge-ernst at interexa dot de
Description: ------------ I encountered a problem similar to the bug #27268 http://bugs.php.net/bug.php?id=27268 The attribut b of the cloned object is still pointing to the attribut of its original object. So changing the attribut in the cloned object also changes the attribute in the original object. Reproduce code: --------------- <?php class a { protected $a = array(); protected $b = ''; public function __construct($b) { $this->b = $b; $this->a['f'] = &$this->b; } public function setB($b) { $this->b = $b; } public function printB() { echo __CLASS__ . $this->b . '/' . $this->a['f'] ."\n"; } public function __clone() { unset($this->a['f']); $this->a['f'] = &$this->b; } } $x1 = new a(5); $x2 = clone $x1; $x2->setB(7); $x1->printB(); $x2->printB(); Expected result: ---------------- a5/5 a7/7 Actual result: -------------- a7/7 a7/7 PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Tue Jun 18 16:01:32 2024 UTC |
This is not a BUG, but expected behavior. look into your __clone() method. $this->a['f'] and $this->b are references to the same variable (to $x1->b). You destroy $this->a['f'], but not $this->b that still point ot $x1->b, and makes $this->a['f'] reference to the same var again. You would probably like change your code to: public function __clone() { unset($this->b); $this->a['f'] = &$this->b; } Now it works as you expected.