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run code in 150+ php & hhvm versions
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<?php $n1 = '7'; $n2 = (float) $n1; var_dump($n1); var_dump($n2);
based on 3eqO4
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "7" float(7)