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run code in 150+ php & hhvm versions
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<?php $zeros = str_repeat('0', 20); var_dump((float) ('123.233242' . $zeros . '2')); var_dump(round('123.233242' . $zeros . '2', 22));
Output for 4.3.0 - 7.1.0
float(123.233242) float(123.233242)