search页面循环里调取3张 自定义的多图字段images

{if $searchid}
				{search module=$dirname order=$params.order id=$searchid total=$sototal catid=$catid page=1 pagesize=6 urlrule=$urlrule more=1 return=s}
				<li class="pd_list_item">
					<div class="pd_i_tit">
						<h3><a href="{$s.url}">{$s.title}</a></h3>
						
					</div>
					<div class="pd_i_data">
						<div class="tag_wrap cls">
							<strong><i class="iconfont"></i>服务</strong>
							<span>
								
								<em>{$cat.name}{php $field = dr_field_options_id(26);$names=array();} {loop $field $value $name}{if in_array($value, $s.fuwu)}{php $names[]=$name;}{/if}{/loop}{php echo implode("、", $names);}</em>
								

							</span>
						</div>
						<div class="data_wrap cls">
							<div class="data_attr">
								<div class="line"><em>类&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;目</em>: <span> {dr_linkagepos('leimu', $s.lm, ' - ')} </span></div>
								<div class="line"><em>所&nbsp;&nbsp;在&nbsp;&nbsp;地</em>: <span>{dr_linkagepos('address', $s.diqu, ' - ')} </span></div>
								<div class="line"><em>经营模式</em>: <span>{php $s.field = dr_field_options_id(125);} {$s.field[$s.jyms]}</span></div>
							</div>
							<div class="data_attr">
								<div class="line"><em>发布时间</em>: <span>{dr_fdate($s._updatetime)}</span></div>
								<div class="line"><em>浏览次数</em>: <span>{$s.hits} 次</span></div>
								<div class="line"><em>图片数量</em>: <span>{count($s.images)} 张</span></div>
							</div>
						</div>
					</div>
					<div class="pd_i_info">
						<div class="tit"><em>代表商品</em><a href="{$s.url}" class="more">更多</a></div>
						<div class="imgs">
						{php $s.images=dr_string2array($s.images);}
							{loop $s.images $i $b}
								{if $i< 3}
									<a href="{$s.url}"><img src="{dr_get_file($b.file)}" alt="{$s.title}"></a>
								{/if}
							{/loop}
							


						</div>
					</div>
				</li>
				{/search}
				{/if}

其中的：

{php $s.images=dr_string2array($s.images);}
{loop $s.images $i $b}
	{if $i< 3}
		<a href="{$s.url}"><img src="{dr_get_file($b.file)}" alt="{$s.title}"></a>
	{/if}
{/loop}

为什么调取不出来图片呢？

赏金5元，谢谢大牛