ob_deflatehandler

(PECL pecl_http >= 0.21.0)

ob_deflatehandler — Deflate output handler

string ob_deflatehandler ( string $data , int $mode )

Замечание: This output handler can only be used once.

The deflate output buffer handler can only be used once.

It conflicts with ob_gzhandler() and zlib.output_compression as well and should not be used after mbstring extension's mb_output_handler() and session extension's URL-Rewriter (AKA session.use_trans_sid).