我希望我知道从哪里开始实际发布查询和while循环示例;然而， 我以前从未做过这样的事情。
我有一个存储html所有信息的数据库 表
在while循环期间，我需要query / while循环来计算每个“width”列具有每个唯一值的次数，并按大小和厚度排序，以便它们按顺序一起显示。然后，在while循环中，我需要根据每个唯一值在数据库中的次数自动设置rowspan。
数据库
name width thickness price
item1 2 x 2 .020 $25
item3 1 x 3 .030 $30
item2 2 x 2 .025 $28
item4 2 x 5 .040 $40
html视图
name | Width | Thickness | Price
--------------------------------------------------
item1 | | .020 | $25
------- 2 x 2 -------------------------------
item2 | | .025 | $28
--------------------------------------------------
item3 | 1 x 3 | .030 | $30
--------------------------------------------------
item4 | 2 x 5 | .040 | $40
注意在数据库中检测到宽度2 x 2两次，因此item1上的rowspan宽度设置为“2”
我最近开始在我的一些while循环中使用以下代码，也许这可以合并，并为某人如何做到这一点。
$firstoccurance = array();
if (!in_array($result['column'], $firstoccurance)) {
if (count($firstoccurance > 1)) { echo 'blah blah blah'; }
echo $result['column'];
$firstoccurance[] = $result['column'];
}
我得到了@ADyson的含义。我喜欢在收集所有数据后设置变量并延迟表的构建直到while循环之后的想法;但是，我无法理解如何以这种方式建立这样做。这是一个伟大的概念;然而，我之前从未做过这样的事情，所以它有点过头了。每当我开始尝试构建变量时，我遇到了障碍，无法掌握如何通过它。如果有人能够根据问题中上面列出的例子来设计基础，我会很高兴。这既适用于学习，也适用于我目前正在进行的设计，因此我无法永远延迟这一点。关于如何设置它，我只是有点过头了。
<?php
$cp_query = $db1q->query("SELECT sku,size,length,thickness,quantity_per_carton,weight_per_carton,cost,margin,price FROM Corner_Protectors WHERE subcat=$subcat AND visibility='1' ORDER BY size,length,thickness") or die ('Unable to execute query. '. mysqli_error($db1q));
if ($cp_query->num_rows > 0) {
$sizes = array();
while ($cp = $cp_query->fetch_assoc()) {
// add sizes into array
if (!in_array($cp['size'], $sizes)) { $sizes[] = $cp['size']; }
}
}
?>
答案 0 :(得分：1)
我首先要按＆＃34; width＆＃34;来命令查询。列，然后行以与您想要显示它们相同的顺序出现。然后，您可以在循环中继续前进，直到宽度值从先前的值更改，然后决定是创建新单元格，还是添加rowspan。
为了帮助解决这个问题，您应该延迟完全构建最终的HTML字符串，直到您知道所有需要知道的内容。而是创建一个变量（或多个变量，根据需要）来存储HTML，然后使用逻辑来改变所创建的内容，并在最后将它们连接在一起，并回显最终字符串，而不是回显当你一起去。
这是一个解决方案。可能有更有效/更简洁的方法来做到这一点，但它是我能在短时间内得出的。请注意，我已使用示例虚拟数据替换了您的数据库代码，但原理是相同的。
<?php
//dummy data array instead of your database output, expanded a little to help with testing:
$data = array(
array("name" => "item1", "size" => "2 x 2", "thickness" => ".020", "price" => "$25"),
array("name" => "item2", "size" => "2 x 2", "thickness" => ".025", "price" => "$28"),
array("name" => "item6", "size" => "2 x 2", "thickness" => ".080", "price" => "$50"),
array("name" => "item3", "size" => "1 x 3", "thickness" => ".030", "price" => "$30"),
array("name" => "item4", "size" => "2 x 5", "thickness" => ".040", "price" => "$40"),
array("name" => "item5", "size" => "2 x 5", "thickness" => ".050", "price" => "$43")
);
$output = array(); //this is ready to hold the table cells
$prevSizeVal = null; //holds the size value from the previous row
$sizeStartRow = 0; //keep track of the row where a rowspanned size cell started
//this is in place of your while loop, you won't need totalRows because the fetch_assoc function takes care of this for you. This is just for the mockup.
$counter = 0;
$totalRows = count($data);
while ($counter < $totalRows) {
$cp = $data[$counter]; //to get an equivalent row variable that the fetch_assoc loop gives you
$row = array(); //create a new output row
//get the boring ones out of the way
$row[0] = "<td>".$cp["name"]."</td>";
$row[2] = "<td>".$cp["thickness"]."</td>";
$row[3] = "<td>".$cp["price"]."</td>";
$sizeCol = "";
//now for the fun part with the size column
if ($prevSizeVal != $cp["size"]) {
$sizeStartRow = $counter;
$sizeCol = '<td rowspan="1">'.$cp["size"].'</td>';
}
else
{
//change the rowspan value at the start position, as we know it's increased
$output[$sizeStartRow][1] = preg_replace('/rowspan="[\d]+"/', 'rowspan="'.($counter-$sizeStartRow +1).'"', $output[$sizeStartRow][1]);
}
$row[1] = $sizeCol;
$output[$counter] = $row; //add the row to the output. We may change the rowspan of the size cell later.
$prevSizeVal = $cp["size"]; //update the previous size value
$counter++;
}
//now we've built the output array of cells, we can echo them into a table.
echo "<table>";
echo "<th>Name</th><th>Size</th><th>Thickness</th><th>Price</th>";
//loop the rows
for ($i = 0; $i < count($output); $i++) {
echo "<tr>";
//loop the cells within the current row
for ($j = 0; $j < count($output[$i]); $j++)
{
$cell = $output[$i][$j];
echo $cell; //some variables will be empty (because we didn't create them because we knew there was a row-spanned cell above them, so nothing will be echoed in those cases
}
echo "</tr>";
}
echo "</table>";
?>
有关工作演示，请访问https://eval.in/961226
需要说明的是，上述内容旨在提供一个有效的演示。要将其集成到原始代码中，请按如下所示进行编写（您可能需要更改某些字段名称以匹配，但不清楚哪些字段名称与示例输出表中的描述完全匹配）：
$output = array();
$prevSizeVal = null;
$sizeStartRow = 0;
$counter = 0;
$cp_query = $db1q->query("SELECT sku,size,length,thickness,quantity_per_carton,weight_per_carton,cost,margin,price FROM Corner_Protectors WHERE subcat=$subcat AND visibility='1' ORDER BY size,length,thickness") or die ('Unable to execute query. '. mysqli_error($db1q));
if ($cp_query->num_rows > 0) {
while ($cp = $cp_query->fetch_assoc()) {
$row = array(); //create a new output row
//get the boring ones out of the way
$row[0] = "<td>".$cp["name"]."</td>";
$row[2] = "<td>".$cp["thickness"]."</td>";
$row[3] = "<td>".$cp["price"]."</td>";
$sizeCol = "";
//now for the fun part with the size column
if ($prevSizeVal != $cp["size"]) {
$sizeStartRow = $counter;
$sizeCol = '<td rowspan="1">'.$cp["size"].'</td>';
}
else
{
//change the rowspan value at the start position, as we know it's increased
$output[$sizeStartRow][1] = preg_replace('/rowspan="\d"/', 'rowspan="'.($counter-$sizeStartRow +1).'"', $output[$sizeStartRow][1]);
}
$row[1] = $sizeCol;
$output[$counter] = $row; //add the row to the output. We may change the rowspan of the size cell later.
$prevSizeVal = $cp["size"]; //update the previous size value
$counter++;
}
//now we've built the output array of cells, we can echo them into a table.
echo "<table>";
echo "<th>Name</th><th>Size</th><th>Thickness</th><th>Price</th>";
//loop the rows
for ($i = 0; $i < count($output); $i++) {
echo "<tr>";
//loop the cells within the current row
for ($j = 0; $j < count($output[$i]); $j++)
{
$cell = $output[$i][$j];
echo $cell; //some variables will be empty (because we didn't create them because we knew there was a row-spanned cell above them, so nothing will be echoed in those cases
}
echo "</tr>";
}
echo "</table>";
}