Detailed explanation of php substr() function processing in Chinese

substr()Function can obtain the specified length substring of string, but when encountering Chinese, garbled characters may be generated at the end of the new string , the following function converts a string longer than $len to end with "..." and removes garbled characters.

用法：$new = getsubstring($old,20); 

function getsubstring($str,$len) 
{ 
    for($i = 0;$i <$end;$i++) 
    { 
        if ($i >=0 AND $i <$end) 
        { 
            if(ord(substr($str,$i,1)) > 0xa1)  
                $result_str.=substr($str,$i,2); 
            else 
                $result_str.=substr($str,$i,1); 
        } 
        if(ord(substr($str,$i,1)) > 0xa1) 
            $i++; 
    } 
    if(strlen($str)<=$end) 
        return $result_str; 
    else 
        return $result_str."..."; 
}

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