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run code in 150+ php & hhvm versions
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<?php $a = 0x80; var_dump($a); var_dump(base_convert($a, 16, 2)); var_dump(base_convert(80, 16, 2));
Output for 4.3.0 - 7.1.0
int(128) string(9) "100101000" string(8) "10000000"