Ftre filter

[jigius]

Hi, SuRaMoN!

I've added simple filter to PathIterator's constructor via forth parameter.
It makes possible to throw out some data from result.

Examples how it use into examples/filter-example{1,2}.php files.

I've used it in project and it realy works.

[SuRaMoN]

hey i'm sorry, but as far as i can see the new functionality can already be achieved with the use of a CallbackFilterIterator

If i look at example1 your code can be replaced with:

$animals = new \CallbackFilterIterator($xml->path('root/animal'), function ($animal) {
return in_array($animal->attributes()->type, ['dog', 'kakariki']);
});
foreach(...) { ... }

The second example can also be replaced with a callbackfilteriterator:

$skipNext = false;
$animals = new \CallbackFilterIterator($xml->path('root/group/*'), function ($animal) use (& $skipNext) {
if ($animal->getName() == 'type') {
$skipNext = (string) $animal == 'wild';
return false;
}
return ! $skipNext;
});

I prefer the CallbackFilterIterator approach above yours because it reuses existing iterators in the php standard library.

so unless i overlooked something, i cannot accept this

[jigius]

Hi,
In case huge XML with deep nested structure and requirement to get a little edge subset data from it. And when "a little edge subset data" depends on some elements/attributes' values of its parents/siblings - my variant, imho, is consuming less memory/cpu and allows to get data in one pass without its later postprocessing, in case of using CallbackFilterIterator.

I've added examples/filter-example3.php. The schema of xml data is a little crazy :)

Try to implement such filtering with using CallbackFilterIterator.