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<?php $fh = fopen('php://temp', 'w+'); fwrite($fh, '123'); var_dump(ftell($fh)); stream_filter_append($fh, 'zlib.deflate', STREAM_FILTER_WRITE, 9); fwrite($fh, 'abc'); var_dump(ftell($fh)); fseek($fh, 0); var_dump(fread($fh, 1024)); fclose($fh);
Output for 7.4.14 - 7.4.33, 8.0.1 - 8.0.26, 8.1.0 - 8.1.13
int(3) int(3) string(12) "123JLJ��"
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.13, 8.0.0
int(3) int(3) string(3) "123"

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