Bug #75629 [NEW]: Object property references are replaced by references created in functions

From: ocramius Operating system: Linux x64 PHP version: Irrelevant Package: Scripting Engine problem Bug Type: Bug Bug description:Object property references are replaced by references created in functions Description: ------------ See https://3v4l.org/BNDsu The PHP engine seems to globally replace references of object properties when new object property references are created in a by-ref function call. The problem occurs when defining a by-ref parameter in a function and then calling it with an object property: function foo(& $param) { // keep a non-gc reference to $param here and things will break } The attached test case demonstrates the issue by using clone and an array of references. The same example works when the references are kept in another object. Possible causes here are: * clone is misbehaving * references are misbehaving overall (YIKES!) * references created in functions are cached somewhere Test script: --------------- --TEST-- Keeping a reference to an object property in an array should not override existing references ?> --FILE-- <?php class Container { /** @var \stdClass|null */ public $referencedProperty; public function __clone() { $this->referencedProperty = clone $this->referencedProperty; } } $references = []; $container = new Container(); $loadFieldByReference = function (& $referencedProperty) use (& $references) { $referencedProperty = new \stdClass(); $references[] = & $referencedProperty; }; $loadFieldByReference($container->referencedProperty); $container->referencedProperty->publicProperty = 123; $clone = clone $container; $clone->referencedProperty->publicProperty = 234; echo $container->referencedProperty->publicProperty, "\n"; echo $clone->referencedProperty->publicProperty, "\n"; echo $container->referencedProperty === $clone->referencedProperty ? "same\n" : "not same\n"; ?> --EXPECT-- 123 234 not same -- Edit bug report at https://bugs.php.net/bug.php?id=75629&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75629&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75629&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75629&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75629&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75629&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75629&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75629&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75629&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75629&r=support Expected behavior: https://bugs.php.net/fix.php?id=75629&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75629&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75629&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75629&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75629&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75629&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75629&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75629&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75629&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75629&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75629&r=mysqlcfg