Bug #67459 [Nab]: DOMDocument memory hanldling

Edit report at https://bugs.php.net/bug.php?id=67459&edit=1 ID: 67459 User updated by: goetas at gmail dot com Reported by: goetas at gmail dot com Summary: DOMDocument memory hanldling Status: Not a bug Type: Bug Package: DOM XML related Operating System: ubuntu PHP Version: 5.5.13 Assigned To: beberlei Block user comment: N Private report: N New Comment: Hi , thanks for the update on this! I can understand that this is the internal behavior (probably connected on how the integration with libxml is done), but it is not intuitive and different from the current OO model exposed by the PHP language. I can understand that the fix might be not easy, but it should then at least documented that the DOMDocument object might nof follow fully the classica OO behavior. Previous Comments: ------------------------------------------------------------------------ [2019-09-22 22:26:13] beberlei@php.net $document->documentElement is not like a public property, but like a magic __set/get property that accepts the element and transaltes it into its internal structure, then "looses" the original element set as argument. This means, accessing $document->documentElement creates a new DOMElement on the fly. Hence reference comparisons will not really work with any DOM nodes at all. ------------------------------------------------------------------------ [2014-06-17 06:45:09] goetas at gmail dot com Description: ------------ Strange object allocation issue, maybe related to PHP/LIBXML memory handling. I've supposed that PHP releases the object associated to $root when I unset it (even if this object can be reached through $dom->documentElement). Later, when I create the $ele element, it takes the same memory position of $root. LIBXML version 2.7.8 Test script: --------------- $dom = new \DOMDocument('1.0', 'UTF-8'); $root = $dom->createElement('root'); $dom->appendChild($root); $h1 = spl_object_hash($root); $h2 = spl_object_hash($dom->documentElement); var_dump($root === $dom->documentElement); // true, OK var_dump($h1 === $h2); // true, OK unset($root); $ele = $dom->createElement('ele'); $h3 = spl_object_hash($ele); $h4 = spl_object_hash($dom->documentElement); var_dump($h1 === $h3); // expected to be false, but actually true var_dump($h1 === $h4); // expected to be true, but actually false Expected result: ---------------- bool(true) bool(true) bool(false) bool(true) Actual result: -------------- bool(true) bool(true) bool(true) bool(false) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67459&edit=1