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run code in 200+ php & hhvm versions
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<?php $number = '11222.349699811871387581'; $result = bcmul($number, '1', 20); var_dump(number_format($result, 20, '-', '_'));
based on U3CbQ
Output for 5.3.17 - 5.5.28, 5.5.31 - 5.5.33, 5.5.35 - 5.6.12, 5.6.16 - 5.6.19, 5.6.21 - 7.0.4, 7.0.6 - 7.2.0
string(27) "11_222-34969981187168741599"
Output for 7.0.5
Fatal error: Uncaught Error: Call to undefined function bcmul() in /in/GBRsc:5 Stack trace: #0 {main} thrown in /in/GBRsc on line 5
Process exited with code 255.
Output for 5.5.29 - 5.5.30, 5.5.34, 5.6.13 - 5.6.15, 5.6.20
Fatal error: Call to undefined function bcmul() in /in/GBRsc on line 5
Process exited with code 255.