Joomla框架字符串截取实例

/*截取字符串方法*/
//$str字符串
//$number为最大长度
function cutStrTitle($str, $number){
  $str = strip_tags($str);
  $en=preg_match('/^[a-zA-Z]/', $str);//匹配英文字母
  $cn=preg_match_all("/([\x{4e00}-\x{9fa5}]){1}/u",$str,$arrc);//匹配汉字，统计个数，返回给$arrc
  if(mb_strlen($str,&#39;UTF8&#39;)<= $number){//&#39;UTF8&#39;跟据字符串的格式调整
    return $str;
  }
  else{
    if($en)
    {
      if($cn){
        //中英文混合情况下
        return mb_substr($str,0,$number+2,&#39;utf-8&#39;).&#39;...&#39;;
      }
      else{
        //全为英文情况下
        return mb_substr($str,0,$number+4,&#39;utf-8&#39;).&#39;...&#39;;
      }
    }
    else {
      //全为中文情况下
      return mb_substr($str,0,$number,&#39;utf-8&#39;).&#39;...&#39;;
    }
  }
}