Trying to access array offset on value of type null

为什么数学老师最喜欢听哪首歌？‘99 Bottles of Beer on the Wall’，因为每瓶啤酒都会让她多出一个方程式。 #生活乐趣# #幽默笑话#

$data['goodsFilter'] = $ngoodsFilter;//获取商品记录$m = new M();$data['priceGrade'] = $m->getPriceGrade($goodsCatIds);$data['goodsPage'] = $m->pageQuery($goodsCatIds); $catPaths = model('goodsCats')->getParentNames($catId); $data['catNamePath'] = '全部商品分类'; if(!empty($catPaths))$data['catNamePath'] = implode(' - ',$catPaths);return $this->fetch($catInfo['catListTheme']?$catInfo['catListTheme']:'goods_list',$data); } /** * 查看商品详情 */ public function detail(){$m = new M();$goods = $m->getBySale(input('goodsId/d',0));if(!empty($goods)){

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