我想创建一个新的包含< div> 3个结果后,使用PDO结果循环.
对于我的自学项目,我必须制作一个带引导程序的产品页面,并且在每第3条记录之后我必须创建一个新行并再次显示3个col-md-4等等.
现在我把它作为我的代码:
<div class="row"> <?PHP while ($row = $stmt->fetch(PDO::FETCH_OBJ)) { ?> <div class="col-md-4"> <div class="product"> <div class="title"><?PHP echo $row->pname ?></div> <div class="img"><img src="../product/img/<?PHP echo $row->pnumber ?>/<?PHP echo $row->pthumbnail ?>.jpg?$pop210x210$"/> </div> <div class="vijftien"></div> <div class="deliver">Levertijd: <strong><?PHP echo $row->pdelivertime ?></strong></div> <div class="vijf"></div> <div class="other"></div> <div class="row"> <div class="col-md-6"> <div class="price"><?PHP echo $row->pprice ?></div> </div> <div class="col-md-6"> <div class="order"> <button class="log_in" id="doLogin">Meer informatie</button> </div> </div> </div> </div> </div> <?PHP } ?> </div>
解决方法
正如塔德曼在你提问的评论中所述.最佳方法应使用
modulus operator(%)和3.
将分离条件放在每次迭代的开始处. (Demo)
像这样:
$x=0; // I prefer to increment starting from zero. // This way I can use the same method inside a foreach loop on // zero-indexed arrays,Leveraging the keys,and omit the `++` line. echo "<div class=\"row\">"; foreach($rows as $row){ if($x!=0 && $x%3==0){ // if not first iteration and iteration divided by 3 has no remainder... echo "</div>\n<div class='row'>"; } echo "<div>$row</div>"; ++$x; } echo "</div>";
这将创建:
<div class="row"><div>one</div><div>two</div><div>three</div></div> <div class='row'><div>four</div><div>five</div><div>six</div></div>
延迟编辑,这里有几个类似情况的其他方法,它们将提供相同的结果:
foreach(array_chunk($rows,3) as $a){ echo "<div class=\"row\"><div>",implode('</div><div>',$a),"</div></div>\n"; }
要么
foreach ($rows as $i=>$v){ if($i%3==0){ if($i!=0){ echo "</div>\n"; } echo "<div class=\"row\">"; } echo "<div>$v</div>"; } echo "</div>";
澄清什么不做……
Sinan Ulker的答案将导致不必要的结果,具体取决于结果数组的大小.
以下是公开问题的一般化示例:
使用此输入数组来表示您的pdo结果:
$rows=["one","two","three","four","five","six"];
思安在每次迭代结束时的情况:
$i=1; echo "<div class=\"row\">"; foreach($rows as $row){ echo "<div>$row</div>"; if($i%3==0)echo "</div>\n<div class='row'>"; // 6%3==0 and that's not good here // 6%3==0 and will echo the close/open line after the content to create an empty,unwanted dom element $i++; } echo "</div>\n\n";
会创建这个:
<div class="row"><div>one</div><div>two</div><div>three</div></div> <div class='row'><div>four</div><div>five</div><div>six</div></div> <div class='row'></div> //<--- this extra element is not good