header("charset=utf-8;");

function StrToBin($str){
    //1.列出每个字符
    $arr = preg_split('/(?<!^)(?!$)/u', $str);
    //2.unpack字符
    foreach($arr as &$v){
        $temp = unpack('H*', $v);
        $v = base_convert($temp[1], 16, 2);
        unset($temp);
    }

    return join(' ',$arr); }

function BinToStr($str){
    $arr = explode(' ', $str);
    foreach($arr as &$v){
        $v = pack("H".strlen(base_convert($v, 2, 16)), base_convert($v, 2, 16));
    }

    return join('', $arr); }

  echo StrToBin("aaaccc天空");  
  echo BinToStr('1100001 1100001 1100001 1100011 1100011 1100011 111001011010010010101001 111001111010100110111010');
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作者：loveinc 
来源：CSDN 
原文：https://blog.csdn.net/loveinc/article/details/68486093 
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