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Bug #54991 domimplementation instance is not a reference inside domdocument
Submitted: 2011-06-04 11:33 UTC Modified: 2019-09-22 23:00 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: giorgio dot liscio at email dot it Assigned: beberlei (profile)
Status: Wont fix Package: DOM XML related
PHP Version: 5.3.6 OS: any?
Private report: No CVE-ID: None
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From: giorgio dot liscio at email dot it
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 [2011-06-04 11:33 UTC] giorgio dot liscio at email dot it
Description:
------------
hi, there is a strange behavior with domimplementation and its reference inside domdocument: i can't determine if a domdocument is bound to a specific implementation, because

$implementation = new \DOMImplementation();
$doc = $implementation->createDocument();
var_dump($doc->implementation === $implementation);

// should be true, but it is false
	


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 [2011-06-04 13:00 UTC] giorgio dot liscio at email dot it
class MyImplementation extends \DOMImplementation
{
	function commonfunc()
	{
		echo "implementation";		
	}
}

$implementation = new MyImplementation();
$doc = $implementation->createDocument();
var_dump($doc->implementation === $implementation);
// raises error:
//doc->implementation->commonfunc();
 [2013-12-03 09:52 UTC] mike@php.net
-Status: Open +Status: Analyzed
 [2013-12-03 09:52 UTC] mike@php.net
.) the objects created by DOMImplementation->create* do not reference the implementation
.) dom_document_implementation_read() always creates a new DOMImplementation object
 [2019-09-22 23:00 UTC] beberlei@php.net
-Status: Analyzed +Status: Wont fix -Assigned To: +Assigned To: beberlei
 [2019-09-22 23:00 UTC] beberlei@php.net
ext/dom doesn't guarantee reference equality, new instances are often created from properties that behave more like "magic" __get returning new instances based on underlying data.

For this case though, PHP DOMImplementation doesn't support any other implementation than the one in code. Also don't trust hasFeature on it, because that data is just hardcoded.
 
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