3v4l.org

run code in 200+ php & hhvm versions
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<?php var_dump(serialize('\x2e\x2e\x2f\x2e\x2e\x2fFLAG.txt'));
based on NaK8e
Output for 4.3.0 - 7.2.0
string(40) "s:32:"\x2e\x2e\x2f\x2e\x2e\x2fFLAG.txt";"