smarty中英文多编码字符截取乱码问题解决方法

<?php
function smartDetectUTF8($string)
{
??? static $result = array();
??? if(! array_key_exists($key = md5($string),$result))
??? {
??????? $utf8 = "
??????????? /^(?:
??????????????? [x09x0Ax0Dx20-x7E]??????????????????????????? # ASCII
??????????????? | [xC2-xDF][x80-xBF]???????????????????????????? # non-overlong 2-byte
??????????????? | xE0[xA0-xBF][x80-xBF]?????????????????????? # excluding overlongs
??????????????? | [xE1-xECxEExEF][x80-xBF]{2}?????????? # straight 3-byte
??????????????? | xED[x80-x9F][x80-xBF]????????????????????? # excluding surrogates
??????????????? | xF0[x90-xBF][x80-xBF]{2}???????????????? # planes 1-3
??????????????? | [xF1-xF3][x80-xBF]{3}????????????????????????? # planes 4-15
??????????????? | xF4[x80-x8F][x80-xBF]{2}????????????????? # plane 16
??????????? )+$/xs
??????? ";
??????? $result[$key] = preg_match(trim($utf8),$string);
??? }
??? return $result[$key];
}
function smartStrlen($string)
{
??? $result = 0;
??? $number = smartDetectUTF8($string) ? 3 : 2;
??? for($i = 0; $i < strlen($string); $i += $bytes)
??? {
??????? $bytes = ord(substr($string,$i,1)) > 127 ? $number : 1;
??????? $result += $bytes > 1 ? 1.0 : 0.5;
??? }
??? return $result;
}
function smartSubstr($string,$start,$length = null)
{
??? $result = '''';
??? $number = smartDetectUTF8($string) ? 3 : 2;
??? if($start < 0)
??? {
??????? $start = max(smartStrlen($string) + $start,0);
??? }
??? for($i = 0; $i < strlen($string); $i += $bytes)
??? {
??????? if($start <= 0)
??????? {
??????????? break;
??????? }
??????? $bytes = ord(substr($string,1)) > 127 ? $number : 1;
??????? $start -= $bytes > 1 ? 1.0 : 0.5;
??? }
??? if(is_null($length))
??? {
??????? $result = substr($string,$i);
??? }
??? else
??? {
??????? for($j = $i; $j < strlen($string); $j += $bytes)
??????? {
??????????? if($length <= 0)
??????????? {
??????????????? break;
??????????? }
??????????? if(($bytes = ord(substr($string,$j,1)) > 127 ? $number : 1) > 1)
??????????? {
??????????????? if($length < 1.0)
??????????????? {
??????????????????? break;
??????????????? }
??????????????? $result .= substr($string,$bytes);
??????????????? $length -= 1.0;
??????????? }
??????????? else
??????????? {
??????????????? $result .= substr($string,1);
??????????????? $length -= 0.5;
??????????? }
??????? }
??? }
??? return $result;
}
function smarty_modifier_smartTruncate($string,$length = 80,$etc = ''...'',
?????????????????????????????????????? $break_words = false,$middle = false)
{
??? if ($length == 0)
??????? return '''';
??? if (smartStrlen($string) > $length) {
??????? $length -= smartStrlen($etc);
??????? if (!$break_words && !$middle) {
??????????? $string = preg_replace(''/s+?(S+)?$/'','''',smartSubstr($string,$length+1));
??????? }
??????? if(!$middle) {
??????????? return smartSubstr($string,$length).$etc;
??????? } else {
??????????? return smartSubstr($string,$length/2) . $etc . smartSubstr($string,-$length/2);
??????? }
??? } else {
??????? return $string;
??? }
}
?>

{$content|smartTruncate:5:".."}($content等于"A中B华C人D民E共F和G国H")