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run code in 200+ php & hhvm versions
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<?php var_dump('f' . 1 . 2); var_dump('f' . 1.2);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.2.2
string(3) "f12" string(4) "f1.2"