3v4l.org

run code in 300+ PHP versions simultaneously
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Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.8 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
string(2) "\\" bool(true) string(4) "5c5c"
Output for 8.1.0 - 8.1.7
string(4) "¥¥" bool(true) string(4) "5c5c"

preferences:
109.05 ms | 411 KiB | 5 Q