phpsmarty函数扩展

functionsmarty_modifier_cn_truncate($string,$strlen=20,$etc="...",
$keep_first_style=false)
{
$strlen=$strlen*2;
$string=trim($string);
if(strlen($string)<=$strlen){
return$string;
}
$str=strip_tags($string);
$j=0;
for($i=0;$i<$strlen;$i++){
if(ord(substr($str,$i,1))>0xa0)$j++;
}
if($j%2!=0)$strlen++;
$rstr=substr($str,0,$strlen);
if(strlen($str)>$strlen){$rstr.=$etc;}
if($keep_first_style==true&&ereg("^<(.*)>$",$string)){
if(strlen($str)<=$strlen){
return$string;
}
$start_pos=strpos($string,substr($str,0,4));
$end_pos=strpos($string,substr($str,-4));
$end_pos=$end_pos+4;
$rstr=substr($string,0,$start_pos).$rstr.substr($string,$end_pos,strlen($string));
}
return$rstr;
}