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PHP判断字符串编码是否为utf8的函数

WBOY
WBOYOriginal
2016-06-20 13:04:591104browse

无意中找到这么一段PHP判断字符串编码是否为utf8的函数,这个应该会用到的，保存下来存个档,这个是据称完美的判断函数，希望是完美的！

// Returns true if $string is valid UTF-8 and false otherwise.  
function is_utf8($word)  
{  
    if (preg_match("/^([".chr(228)."-".chr(233)."]{1}[".chr(128)."-".chr(191)."]{1}[".chr(128)."-".chr(191)."]{1}){1}/",$word) == true || preg_match("/([".chr(228)."-".chr(233)."]{1}[".chr(128)."-".chr(191)."]{1}[".chr(128)."-".chr(191)."]{1}){1}$/",$word) == true || preg_match("/([".chr(228)."-".chr(233)."]{1}[".chr(128)."-".chr(191)."]{1}[".chr(128)."-".chr(191)."]{1}){2,}/",$word) == true)  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
} // function is_utf8

 


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