ob_deflatehandler(PECL pecl_http >= 0.21.0) ob_deflatehandler — Deflate output handler Описание
   string ob_deflatehandler
    ( string $data
   , int $mode
   ) 
  Используйте вместе с ob_start(). 
 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). Смотрите также
 
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