Bug #68464 [Opn->Csd]: Undetected recursion when using __debugInfo()

Edit report at https://bugs.php.net/bug.php?id=68464&edit=1 ID: 68464 Updated by: dmitry@php.net Reported by: dev at pp3345 dot net Summary: Undetected recursion when using __debugInfo() -Status: Open +Status: Closed Type: Bug Package: Scripting Engine problem Operating System: Debian 7 Wheezy PHP Version: 5.6.3 -Assigned To: +Assigned To: dmitry Block user comment: N Private report: N New Comment: The bug has been fixed in PHP-7.0. Previous Comments: ------------------------------------------------------------------------ [2014-11-20 19:15:27] dev at pp3345 dot net Description: ------------ Hello, it seems that the recursion detection for var_dump() doesn't work when using objects with __debugInfo(), which causes an infinite loop. The problem seems to be located in ext/standard/var.c:129: myht = Z_OBJDEBUG_PP(struc, is_temp); if (myht && ++myht->nApplyCount > 1) { PUTS("*RECURSION*\n"); --myht->nApplyCount; return; } Z_OBJDEBUG_PP() gives either a hashtable containing all properties of an object or, if __debugInfo() is available, the hashtable returned by that method. Since this hashtable is recreated on every call to __debugInfo(), changing it's nApplyCount value won't help for detecting object recursion. Probably the objprop hashtable should always be used for recursion detection. Test script: --------------- <?php class A { public $x = null; public function __debugInfo() { return ["x" => $this->x]; } } class B { public $y = null; public function __debugInfo() { return ["y" => $this->y]; } } $a = new A; $a->x = new B; $a->x->y = $a; var_dump($a); Expected result: ---------------- object(A)#1 (1) { ["x"]=> object(B)#2 (1) { ["y"]=> *RECURSION* } } Actual result: -------------- Infinite loop ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=68464&edit=1