php form表单里的判断,该如何解决

php form表单里的判断
{{foreach from=$selectAry item=select}}
{{if $select.id == sid}}
  {{$select.name}}
{{/if}}
{{/foreach}}
我这里循环输出了但是我让想他输出一个是对应我这个表单里的id的我怎么样做判断，我现在这样的判断一个都输不出来了
如果把判断去了就输出两个

PHP code

 <form name="favForm" id="favForm" action="javascript:void(0)" method="POST">                    <input type="hidden" id="hidden_sid" name="part[sid]" value="">                    <input type="hidden" id="hidden_uid" name="part[uid]" value="{{$uid}}">                    <p bgcolor="blue" style="margin-top:30px;">                                             {{foreach from=$selectAry item=select}}                             {{if $select.id == sid}}                                               {{$select.name}}                           {{/if}}                          {{/foreach}}                                                 <input type="radio" id="is_good_1"  name="part[is_good]" value="1"><img src="http://static.h-elab.com/img/xiao.gif"><input type="radio" id="is_good_2" name="part[is_good]" value="0"><img src="http://static.h-elab.com/img/ku.gif">                    </p>                    <div id="isPlist" style="margin-top:4px;">                        <p><textarea id='part_text' name="part[text]"  cols="28" rows="4" style="padding:3px;font-size:15px;LINE-HEIGHT:18px; height:90px;" onclick="clien();">输入您的看法,字数在50字内</textarea></p>                    </div>                    <p>                        <input type="button" id="favButton" value="确 定" class="pop_but" onclick="sendData();showDiv();">                        <input type="reset" id="button" value="取 消" class="pop_but" onclick="showDiv();" style="margin-left:40px;">                    </p>                </form>

JScript code

function sendData(){    var uid=document.getElementById('hidden_uid').value;    var sid = document.getElementById('hidden_sid').value;    var text = document.getElementById('part_text').value;    var rideo = document.getElementsByName('part[is_good]');    var is_good;    if(text == '' || text == '输入您的看法,字数在50字内'){        alert('请提出您的看法,不然投票无效哦!');        return false;    }    alert (sid);    for(var i=0; i<rideo.length;i++){        if(rideo[i].checked == true){            is_good = rideo[i].value;        }    }    var url = 'http://www.h-elab.com/ajax/part/recode.php';    $.getJSON(url,{uid:uid,sid:sid,text:encodeURIComponent(text),is_good:is_good},function(data){        return true;    });}