ok so this function returns the gz file pointer as the uncompressed data byte length so if you are trying to put something in to specific size gzip files it won't work.Example: <?//some_file.sql filesize = 2,048,000 bytes$text_fp=fopen('some_file.sql','r');$gz_fp=gzopen('some_file.sql.gz','wb9');while(!feof($text_fp)){ gzwrite($gz_fp,fread($text_fp,655360));}fclose($text_fp);echo "gztell = ".gztell($gz_fp)."<BR>\n";gzclose($gz_fp);echo "filesize = ".filesize('some_file.sql.gz')."<BR>\n";?>Output:gztell = 2048000filesize = 249264I will report this as a bug but post a note here for now