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run code in 200+ php & hhvm versions
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<?php var_dump(chr(90)); var_dump(chr(90)); var_dump(chr(61)); var_dump(chr(100)); var_dump(chr(71)); var_dump(chr(49)); var_dump(chr(50)); var_dump(chr(104)); var_dump(chr(87)); var_dump(chr(61));
based on DSf90
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
string(1) "Z" string(1) "Z" string(1) "=" string(1) "d" string(1) "G" string(1) "1" string(1) "2" string(1) "h" string(1) "W" string(1) "="