In PHP, you can read in extreme large XML files with the
$reader = new XMLReader(); $reader->open($xmlfile);
Extreme large XML files should be stored in a compressed format on disk. At least this makes sense as XML files have a high compression ratio. For example gzipped like
PHP supports that quite well with
XMLReader via the compression wrappersDocs:
$xmlfile = 'compress.zlib://path/to/large.xml.gz'; $reader = new XMLReader(); $reader->open($xmlfile);
XMLReader allows you to operate on the current element "only". That means it's forward-only. If you need to keep parser state, you need to build it your own.
I often find it helpful to wrap the basic movements into a set of iterators that know how to operate on
XMLReader like iterating through elements or child-elements only. You find this outlined in Parse XML with PHP and XMLReader.
See as well:
- PHP open gzipped XML