help with stream filter

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Hi, everyone

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Has anyone tried to use stream filter to decompress a large =
file?
My problem when doing this is memory consume.

My php process requires more and more memory as time goes. Is this a bug =
or
just I don¡¯t get the right usage?

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My code as follows:

26 $fp =3D fopen ( $filename, 'r' );

27 $filter =3D stream_filter_append($fp, 'bzip2.decompress',
STREAM_FILTER_READ);

28=20

29 $counter =3D 0;=20

30 while ( ! feof ( $fp ) )

31 {

32 $counter ++;

33 $line =3D fgets ( $fp );=20

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Thanks!

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