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run code in 150+ php & hhvm versions
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<?php var_dump(mb_convert_case('p "p', MB_CASE_TITLE));
Output for 5.2.7 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(4) "P "p"
Output for 4.3.0 - 5.2.6
string(4) "P "P"