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<?php var_dump(bcmul('10000000', '0.00001', 5));
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 8.0.0 - 8.0.12, 8.1rc1 - rc3
string(9) "100.00000"

preferences:
50.03 ms | 460 KiB | 5 Q