Test: /tests/output/stream_isatty_in-err.phpt - Version 7.4.13    

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683 (100%)
004+ STDOUT (constant): bool(false) 005+ STDOUT (fopen): bool(false) 006+ STDOUT (php://fd/1): bool(false) 004- STDOUT (constant): bool(true) 005- STDOUT (fopen): bool(true) 006- STDOUT (php://fd/1): bool(true)