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run code in 150+ php & hhvm versions
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<?php var_dump(round("123.343000", 3)); var_dump((float) "123.343000");
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
float(123.343) float(123.343)