Define a Custom Iterator in PHP 5.4.x?

Question

Does PHP (5.4.x) allow one to create custom iterators that can be dropped into foreach loops ? (I have seen an iterator example that was fairly clunky)

I am accessing a web API that only allows one to pull N rows/objects per call, which results in clunky local code - ie an outer loop for grabbing a batch of data from the API and an inner loop for processing the elements of each batch.

I would prefer to push the outer loop into an iterator (that pulls down blocks of data and keeps track of the index into the external API etc) so I can write code more like this:

$datastream = new ApiIterator(/*params here*/);
foreach($datastream as $row){
   // do inner loop processing here
}

Thanks!

Answer 1

从PHP 5.0开始，您可能需要使用PHP的Class Iterator接口（ http://php.net/manual/en/class.iterator.php ）并在ApiIterator Class中对其进行扩展（实现）