note 118732 added to domnode.c14n

Good to know: << Due to a known issue in XML canonicalization in PHP, processing large metadata files in SimpleSAMLphp takes a big amount of resources, with that amount growing approximately by the square of the number of entities in the metadata set >> https://simplesamlphp.org/metaprocessing << The C14N() function appears to have a runtime that is O(N^2) (or possibly worse?) depending on input size, which means that it becomes very slow as the input grows. For example, an input with around 196000 nodes takes about 290 seconds, while an input with 486000 nodes takes 2200 seconds. >> https://bugs.php.net/bug.php?id=53655 We had the same issue with a 4.1 MB XML (105k lines). The sample code of ticket #53655 takes 1h36 minute to canonicalize it! ---- Server IP: 72.52.91.14 Probable Submitter: 212.41.222.237 ---- Manual Page -- http://php.net/manual/en/domnode.c14n.php Edit -- https://master.php.net/note/edit/118732 Del: integrated -- https://master.php.net/note/delete/118732/integrated Del: useless -- https://master.php.net/note/delete/118732/useless Del: bad code -- https://master.php.net/note/delete/118732/bad+code Del: spam -- https://master.php.net/note/delete/118732/spam Del: non-english -- https://master.php.net/note/delete/118732/non-english Del: in docs -- https://master.php.net/note/delete/118732/in+docs Del: other reasons-- https://master.php.net/note/delete/118732 Reject -- https://master.php.net/note/reject/118732 Search -- https://master.php.net/manage/user-notes.php