3v4l.org

run code in 300+ PHP versions simultaneously
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Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.17, 8.4.1 - 8.4.4
PASS: both are empty strings (true) PASS: both are non-empty, matching strings (true) PASS: both are non-empty, unmatching strings (false) PASS: $mode is null and development mode is an empty string (false) PASS: $mode is an empty string, development mode is a non-empty string (false) PASS: $mode is a non-empty string, development mode is an empty string (false)
preferences:
81.28 ms | 412 KiB | 5 Q