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<?php $str = chr(255); var_dump( $str, strtobits($str), mb_check_encoding($str, '7bit'), is_7bit_clean($str) ); function is_7bit_clean(string $str):bool{ for($i=0,$imax=strlen($str);$i<$imax;++$i){ if(ord($str[$i]) & (1 << 7)){ return false; } } return true; } function strtobits(string $str): string { $ret = ""; for ($i = 0; $i < strlen($str); ++ $i) { $ord = ord($str[$i]); for ($bitnum = 7; $bitnum >= 0; -- $bitnum) { if ($ord & (1 << $bitnum)) { $ret .= "1"; } else { $ret .= "0"; } } } return $ret; }
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "�" string(8) "11111111" bool(false) bool(false)

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