Bug #51846 [Fbk->Opn]: SimpleXMLElement iterator produces unexpected results

Edit report at http://bugs.php.net/bug.php?id=51846&edit=1 ID: 51846 User updated by: henning at glatter-gotz dot com Reported by: henning at glatter-gotz dot com Summary: SimpleXMLElement iterator produces unexpected results -Status: Feedback +Status: Open Type: Bug Package: SimpleXML related Operating System: windows xp / Linux PHP Version: 5.3.2 New Comment: For windows I downloaded the latest available VC6 x86 Thread Safe (2010-Mar-04 20:11:08) binaries, and tried it (see original report). I cannot build from Source on Linux, I do not have sufficient access to a system to do that. Sorry. But I did test on two different OS' and 3 different versions of PHP. Previous Comments: ------------------------------------------------------------------------ [2010-05-18 02:58:11] felipe@php.net Please try using this snapshot: http://snaps.php.net/php5.3-latest.tar.gz For Windows: http://windows.php.net/snapshots/ ------------------------------------------------------------------------ [2010-05-18 02:56:11] henning at glatter-gotz dot com Added Linux (Ubuntu) to the OS field. ------------------------------------------------------------------------ [2010-05-18 02:53:34] henning at glatter-gotz dot com Now also tested on PHP 5.3.2-1ubuntu4.1 with Suhosin-Patch (cli) (built: May 4 2010 06:56:22). It fails with the same result as on Windows. ------------------------------------------------------------------------ [2010-05-18 02:37:26] henning at glatter-gotz dot com Description: ------------ When loading an xml document with simplexml_load_string() that contains 2500 or more child elements, iterating over these with a foreach loop and pushing results into an array results in 4998 array entries, when only 2500 are expected. See sample code for the exact conditions under which this occurs. There are two foreach loops, the first behaves as expected and results in an array of exactly 2500 objects of type A, whereas the second foreach loop that instantiates an object of type B in each iteration ends up being of size 4998. Note that the object B takes two parameters in the constructor. This behavior is only exhibited if both parameters are arrays. If one is changed to an int for example the code runs as expected. Also, if the xml files contains 2499 elements or less, the code also works as expected. Executed on the command line in the following environments: 1) Windows XP, PHP 5.3.1 (cli) (built: Nov 20 2009 17:26:32) -> FAIL 2) Windows XP, PHP 5.3.2 (cli) (built: Mar 3 2010 19:40:13) -> FAIL 3) PHP 5.2.10-2ubuntu6.4 with Suhosin-Patch 0.9.7 (cli) (built: Jan 6 2010 22:56:44) -> SUCCESS Setups 1 and 3 are production environments and have slightly modified php.ini files. Setup 2 is an "out of the box" download of VC6 x86 Thread Safe (2010-Mar-04 20:11:08) from http://windows.php.net/download/. No changes were made to it. Test script: --------------- class A {} class B { protected $v1; protected $v2; public function __construct($v1, $v2) { $this->v1 = $v1; $this->v2 = $v2; } } $xml_string = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><rows>"; for ($i = 0; $i < 2500; ++$i) { $xml_string .= "<row>bla</row>"; } $xml_string .= "</rows>"; $xml = simplexml_load_string($xml_string); $a1 = array(); $a2 = array(); foreach ($xml->row as $r) { $a1[] = new A(); } foreach ($xml->row as $r) { $val1 = array(); $val2 = array(); $a2[] = new B($val1, $val2); } echo 'count(a1) = '.count($a1).PHP_EOL; echo 'count(a2) = '.count($a2).PHP_EOL; Expected result: ---------------- count(a1) = 2500 count(a2) = 2500 Actual result: -------------- count(a1) = 2500 count(a2) = 4998 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=51846&edit=1