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<?php $str = "\x00\x00\x00"; var_dump(bin2hex($str)); $str[1] = "\xff"; var_dump(bin2hex($str));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(6) "000000" string(6) "00ff00"