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run code in 150+ php & hhvm versions
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<?php $mask = bindec("111101001"); $bit = bindec("100"); $mask = $mask & (~ $bit); var_dump(decbin($mask));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(9) "111101001"