//1：获取中英文混合字符的编码（ASCII码与UNICODE码）
$str = "官网制作:网巢网络";
foreach (math($str) as $key => $value) {
    if (preg_match('/^[x{4e00}-x{9fa5}]+$/u',$value)) {//中文，注意中文这里暂时不转换，因为无法通过chr函数来获取中文，
        $arr_chr[]=unicode_encode($value);
    } else {//英文
        $arr_chr[]=asc($value);
    }
}
//再将数组转换成字符串
$strs = implode(",", $arr_chr);


//2：将上面的字符串解析成原来的字符串
$arr_chr = explode(",", $strs);
foreach ($arr_chr as $key => $value) {
    if(is_numeric($value))//如果是数字将ASCII码转换成英文字符
    {
        echo chr($value);
    }else{//否则将UNICODE编码后的内容进行解码成汉字
        echo unicode_decode($value);
    }
}

//函数
//php将字符串分割成数组实现中文分词
function math($string,$code ='UTF-8'){
    if ($code == 'UTF-8') {
     $pa = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/";
    } else {
        $pa = "/[x01-x7f]|[xa1-xff][xa1-xff]/";
    }
    preg_match_all($pa, $string, $t_string);
    $math="";
    foreach($t_string[0] as $k=>$s){
        $math[]=$s;
    }
     return $math;
}
//转换成ascii码，注意其实中文是没有ascii码的，所以最好将中文转成UNICODE编码
function asc($s) {
  if(ord($s) < 128) return ord($s);
  //return current(unpack('N', "xffxff$s"));
}
//将中文进行UNICODE编码，编码后的内容格式：u56feu7247
function unicode_encode($name)  
{  
    $name = iconv('UTF-8', 'UCS-2', $name);
    $len = strlen($name);  
    $str = '';  
    for ($i = 0; $i < $len - 1; $i = $i + 2)  
    {  
        $c = $name[$i];  
        $c2 = $name[$i + 1];  
        if (ord($c) > 0)  
        {    // 两个字节的文字  
            $str .= 'u'.base_convert(ord($c), 10, 16).base_convert(ord($c2), 10, 16);  
        }  
        else  
        {  
            $str .= $c2;  
        }  
    }  
    return $str;  
}
// 将UNICODE编码后的内容进行解码变成汉字
function unicode_decode($name)  
{  
    // 转换编码，将Unicode编码转换成可以浏览的utf-8编码  
    $pattern = '/([w]+)|(\u([w]{4}))/i';  
    preg_match_all($pattern, $name, $matches);  
    if (!empty($matches))  
    {  
        $name = '';  
        for ($j = 0; $j < count($matches[0]); $j++)  
        {  
            $str = $matches[0][$j];  
            if (strpos($str, '\u') === 0)  
            {  
                $code = base_convert(substr($str, 2, 2), 16, 10);  
                $code2 = base_convert(substr($str, 4), 16, 10);  
                $c = chr($code).chr($code2);  
                $c = iconv('UCS-2', 'UTF-8', $c);  
                $name .= $c;  
            }  
            else  
            {  
                $name .= $str;  
            }  
        }  
    }  
    return $name;  
}