";foreach($rows 作为 $row){echo "<div>$row</div>";if($i%3==0)echo "</div>
<div class='row'>";//6%3==0 这在这里不好//6%3==0 并且将在内容之后回显关闭/打开行以创建一个空的、不需要的 dom 元素$i++;}echo "</div>
";
将创建此:
<div class='row'><div>四</div><div>五</div><div>六</div></div><div class='row'></div>//<--- 这个额外的元素不好
I would like to create a new containing <div> after 3 results, using PDO result loop.
For my self-study-project I have to made a product page with bootstrap and after every 3rd record I have to make a new row and show again 3 col-md-4's, etc, etc.
Now I have this as my code:
<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>
I have visited and studied other questions but I do not really get the idea of how they are doing it and how I can implement the correct method into my code.
解决方案
As tadman stated in the comment under your question. The best approach should use a modulus operator (%) with 3.
Place your separating condition at the start of each iteration. (Demo)
Like this:
$x=0; // I prefer to increment starting from zero.
// This way I can use the same method inside a foreach loop on
// zero-indexed arrays, leveraging the keys, and omit the `++` line.
echo "<div class="row">";
foreach($rows as $row){
if($x!=0 && $x%3==0){ // if not first iteration and iteration divided by 3 has no remainder...
echo "</div>
<div class='row'>";
}
echo "<div>$row</div>";
++$x;
}
echo "</div>";
This will create:
<div class="row"><div>one</div><div>two</div><div>three</div></div>
<div class='row'><div>four</div><div>five</div><div>six</div></div>
Late Edit, here are a couple of other methods for similar situations which will provide the same result:
foreach(array_chunk($rows,3) as $a){
echo "<div class="row"><div>",implode('</div><div>',$a),"</div></div>
";
}
or
foreach ($rows as $i=>$v){
if($i%3==0){
if($i!=0){
echo "</div>
";
}
echo "<div class="row">";
}
echo "<div>$v</div>";
}
echo "</div>";
To clarify what NOT to do...
Sinan Ulker's answer will lead to an unwanted result depending on the size of your result array.
Here is a generalized example to expose the issue:
Using this input array to represent your pdo results:
$rows=["one","two","three","four","five","six"];
Sinan's condition at the end of each iteration:
$i=1;
echo "<div class="row">";
foreach($rows as $row){
echo "<div>$row</div>";
if($i%3==0)echo "</div>
<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>
";
Will create this:
<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
这篇关于每 3 条记录后包含一个新的 div的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
