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run code in 150+ php & hhvm versions
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<?php class AbCd {} var_dump( serialize( new AbCd ) );
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(15) "O:4:"AbCd":0:{}"
Output for 4.3.0 - 4.4.9
string(15) "O:4:"abcd":0:{}"