下面这个怎么样输出显示文本格式，就是有HTML标签也可以正常显示出来。
if($array){
foreach($array AS $key=>$vo){
$groups .= "<div class='input-group'>
<span class='input-group-addon add'><i class='fa fa-plus-square'></i></span>
<input class='wri title1' type='{$type1}' value='{$vo['title1']}' placeholder='{$title1}'>
<input class='wri title2' type='{$type2}' value='{$vo['title2']}' placeholder='{$title2}'>
<input class='wri title3' type='{$type3}' value='{$vo['title3']}' placeholder='{$title3}'>
<input class='wri title4' type='{$type4}' value='{$vo['title4']}' placeholder='{$title4}'>
<span class='input-group-addon del'><i class='fa fa-fw fa-close'></i></span>
<span class='input-group-addon down'><i class='fa fa-arrow-down'></i></span>
<span class='input-group-addon up'><i class='fa fa-arrow-up'></i></span>
</div>";
}
用什么写？