如何重写PHP和MySQL以按相等的列值对HTML列表进行分组？

编程问答 2021-09-23

问题描述

在构建列表之前，应首先将它们进行相应的分组（如结构所示），然后才能构建列表。考虑以下示例：

<?PHP

$original_data = array();
$link = new MysqLI('localhost', 'username', 'password', 'database');
// normal select
$query = MysqLi_query($link, 'SELECT * FROM Sheet1 order by country, state, city');
while($row = $query->fetch_assoc()) {
    $original_data[] = $row;
}

$ordered_data = array();
foreach($original_data as $key => $value) {
    // group them
    $ordered_data[$value['country']][$value['state']][$value['city']][] = $value;
}

?>

<!-- print them accordingly -->
<?PHP foreach($ordered_data as $country => $state_values): ?>
    <ul>
        <li><?PHP echo $country; ?></li>
        <?PHP foreach($state_values as $state => $city_values): ?>
        <ul>
            <li><?PHP echo $state; ?></li>
                <ul>
                    <?PHP foreach($city_values as $city => $value): ?>
                        <li><?PHP echo $city; ?></li>
                        <ul>
                            <?PHP foreach($value as $index => $element): ?>
                                <li><?PHP echo $element['Business'] . ' | ' . $element['Phone']; ?></li>
                            <?PHP endforeach; ?>
                        </ul>
                    <?PHP endforeach; ?>
                </ul>
        </ul>
        <?PHP endforeach; ?></li>
    </ul>
<?PHP endforeach; ?>

解决方法

我有一个数据库表，看起来像这样：

Business     Phone        City       State         Country

Baker      12345678    CityName 1  StateName 1   CountryName 1
Mason      91834919    CityName 2  StateName 2   CountryName 1
Welder     58149918    CityName 3  StateName 1   CountryName 1
Painter    48194918    CityName 4  StateName 3   CountryName 2
Chef       95982848    CityName 5  StateName 4   CountryName 3
Vendor     96928248    CityName 1  StateName 1   CountryName 1

我有这个PHP和MySQL在我的网页上生成一个无序列表：

<?$con = mysql_connect("localhost","root","testdb");
 $db = mysql_select_db("table",$con);
 $get=mysql_query("SELECT * FROM Sheet1 ORDER BY country,state,region,city ASC");
  $result = '';
 while($row = mysql_fetch_assoc($get))
{
  $result .= "<ul class='tree'><li>" . $row['country'] . "<ul><li>" . $row['state'] . "<ul><li>" . $row['region'] . "<ul><li>" . $row['city'] . "<ul><li>" . $row['business'] . " | Phone #: " . $row['phone'] . "</li></ul></li></ul></li></ul></li></ul></li></ul>";
}?>

这是我的html：

<?php echo $result; ?>

输出如下：

 CountryName 1
    - StateName 1
        * CityName 1
            * Vendor | 9692824
 CountryName 1
    - StateName 1
        * CityName 1
            * Baker | 12345678
 CountryName 1
    - StateName 1
        * CityName 3
            * Welder | 58149918
 CountryName 1
    - StateName 2
        * CityName 2
            * Mason | 91834919
 CountryName 2
    - StateName 3
        * CityName 4
            * Painter | 48194918

我希望这样输出：

 CountryName 1
    - StateName 1
        * CityName 1
            * Vendor | 9692824
            * Baker | 12345678
        * CityName 3
            * Welder | 58149918 
    - StateName 2
        * CityName 2
            * Mason | 91834919 
 CountryName 2
    - StateName 3
        * CityName 4
            * Painter | 48194918
 CountryName 3
    - StateName 4
        * CityName 5
            * Chef | 95982848

我必须进行哪些更改才能实现此目的？

我发现这比我现在写的要复杂得多。

sqlsql