<?php if(strlen($r[title])>45){$str=utf8Substr($r[title],0,15)."...";}else{$str=$r[title];}echo $str; ?>
//截取utf8字符串
function utf8Substr($str, $from, $len)
{
return preg_replace('#^(?:[/x00-/x7F]|[/xC0-/xFF][/x80-/xBF]+){0,'.$from.'}'.
'((?:[/x00-/x7F]|[/xC0-/xFF][/x80-/xBF]+){0,'.$len.'}).*#s',
'$1',$str);
}