#41452 [Opn->WFx]: possible memory leak in DomNode->first_child

ID: 41452 Updated by: rrichards@php.net Reported By: mike at netagi dot com -Status: Open +Status: Wont fix Bug Type: DOM XML related Operating System: Ubuntu Linux 6.06 LTS PHP Version: 4.4.7 New Comment: You need to upgrade to PHP 5 and ext/DOM. This is just one of the reasons for the re-write of ext/domxml. Unset() and variable scope have no effect on the structures created by ext/domxml and they are not freed until the request is completed. Previous Comments: ------------------------------------------------------------------------ [2007-05-21 06:45:25] mike at netagi dot com Description: ------------ Directly after calling node->first_child the memory usage increases and does not drop. This might also be the case with has_child_nodes. I've tried numerous test cases (as I am trying to keep memory consumption low) but have had no luck. I've tried using functions so the variables lose scope etc. Whatever gets created during the first_child can never be freed. I understand that the Zend Engine may be caching some structures, however i have allocated 120 Meg to PHP4 CLI and it's still returning an out of memory error. If I disable first_child the script runs without any issues. Reproduce code: --------------- $doc = domxml_open_file("import_prod_cat.xml"); $xpath = $doc->xpath_new_context(); $obj = $xpath->xpath_eval('//import_catprod_link'); $nodeset = $obj->nodeset; foreach($nodeset as $node ) { print "S1 " . memory_get_usage() . "\n"; if( $node->has_child_nodes() ) { print " S2 " . memory_get_usage() . "\n"; $child = $node->first_child(); print " S3 " . memory_get_usage() . "\n"; unset($child); unset($node); print " S4 " . memory_get_usage() . "\n"; } print " S6 " . memory_get_usage() . "\n"; } $doc->free(); Actual result: -------------- S1 21202968 S2 21203040 S3 21204416 S4 21204456 S5 21204456 S1 21204456 S2 21204456 S3 21205184 S4 21205224 S5 21205224 S1 21205224 S2 21205224 S3 21205952 S4 21205992 S5 21205992 S1 21205992 S2 21205992 S3 21206720 S4 21206760 S5 21206760 ... etc until it runs out of ram. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=41452&edit=1