quick lesson in using stream filters

Sara Golemon在新闻组发了一篇关于在PHP扩展中如何使用stream filters的文章，参考如下：

If all you want to do is use an already implemented one just do this:

php_stream *stream;

php_stream_filter *filter;

zval *arguments = NULL; /* Populate this with value(s) appropriate to the filter */

stream = php_stream_open_wrapper(.....blah blah blah.....);

filter = php_stream_filter_create("filtername", arguments, php_stream_is_persistent(stream) TSRMLS_CC);

/* Or &stream->writefilters as appropriate */

php_stream_filter_append(&stream->readfilters, filter);

/* Of course, in the real world you'll want to check both stream and filter for NULL as they may have failed to instantiate */

That said, I don't think iconv.* will be any help. It only covers

base64_(en|de)code() and quoted_printable_(en|de)code().

Filter implementation is a bit trickier. Take a look at

ext/standard/filters.c for more info on that. If you come up with a UTF

converter, I'm sure it can be added to the standard set of filters.

-Sara

"L0t3k" <cshmoove@xxxxxxxxxxxxx> wrote in message

> can anyone give a hint as to how to use stream filters from an extension ?

> i have to parse input files which may be in a variety of encodings (mainly

> UTF8), and processing is done internally in UTF16.

> i noticed that there is an iconv filter, but i havent a clue (even after

> googling) of how to use it.

> l0t3k

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