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run code in 150+ php & hhvm versions
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<?php function f($bytes) { return floor(($bytes ? log($bytes) : 0) / log(1024)); } var_dump(f(200000)); var_dump(f(15000)); var_dump(f(2000000));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
float(1) float(1) float(2)