我有一个数组，其中包含多个属性，例如国家/地区，州/省/电话号码。我的问题是，我想让国家成为拥有与以下国家相同的国家的元素：
California (This should be heading)
Los Angeles
San Diego
San Francisco
我的数组如下：
Array
(
[0] => Array
(
[id] => 14
[post_id] => 319
[location] => Atlanta, GA
[address] => 161 Racetrack Rd., McDonough
[city] => Atlanta
[state] => Georgia
[state_code] => GA
[country] => USA
[zipcode] => 30253
[service_zipcode] =>
[phone] =>
[fax] =>
[email] =>
[facebook] =>
[twitter] =>
[linkedin] =>
[gplus] =>
[latitude] =>
[longitude] =>
[url] =>
[created_at] => 2019-04-22 07:22:55
[updated_at] => 2019-04-22 07:26:31
)
[1] => Array
(
[id] => 16
[post_id] => 321
[location] => Augusta, Georigia
[address] => 1446 Harper Street
[city] => Augusta
[state] => Georigia
[state_code] => GA
[country] => USA
[zipcode] =>
[service_zipcode] =>
[phone] =>
[fax] =>
[email] =>
[facebook] =>
[twitter] =>
[linkedin] =>
[gplus] =>
[latitude] =>
[longitude] =>
[url] =>
[created_at] => 2019-04-22 07:29:33
[updated_at] => 2019-04-22 07:32:25
)
[2] => Array
(
[id] => 12
[post_id] => 317
[location] => Savannah, Georgia
[address] => 834 Northside Dr. East
Statesboro
[city] => Savannah
[state] => Georgia
[state_code] => GA
[country] => USA
[zipcode] => 30458
[service_zipcode] =>
[phone] =>
[fax] =>
[email] =>
[facebook] =>
[twitter] =>
[linkedin] =>
[gplus] =>
[latitude] =>
[longitude] =>
[url] =>
[created_at] => 2019-04-22 07:15:43
[updated_at] => 2019-04-22 07:18:11
)
)
因此，当有州的城市相同时，应首次将州显示为标题。我的数组只有一个状态的数据，但确实要考虑多个状态的数据。我有什么办法可以为此做一个独特的标题吗？
更新：我的代码是
<div class="row">
<div class="col-md-12 contentside">
<div class="locations-container">
<?php
global $wpdb;
$querystr = "
SELECT DISTINCT meta_value
FROM $wpdb->postmeta
WHERE meta_key = 'state_code'
ORDER BY meta_value ASC
";
$us_states = $wpdb->get_results( $querystr );
//echo "<pre>"; print_r($us_states); echo "<pre>";
foreach($us_states as $us_state) { ?>
<?php $locations = \abc\Helper\Location::getLocationsByState($us_state->meta_value); ?>
<h2>Here I want to display heading for state but it is outside loop</h2>
<?php //echo "<pre>"; print_r($locations); echo "</pre>"; ?>
<?php foreach($locations as $location): ?>
<div class="location-single">
<h3>Mosquito Hunters of <?php echo $location['location']; ?></h3>
<div class="location-inner">
<img src="/wp-content/uploads/2019/04/eco-freeze-bed-bugs.jpg" alt=" ">
<p> <?php echo $location['city'] ?>, <?php echo $location['state_code'] ?><br />
<a href="mailto:<?php echo $location['email'] ?>"><?php echo $location['email'] ?></a><br />
<a href="tel:<?php echo $location['phone'] ?>"><?php echo $location['phone'] ?></a></p>
<a href="<?php echo $location['url'] ?>" class="btn">Learn about this location</a>
</div>
</div>
<?php endforeach; ?>
<?php } ?>
</div>
</div>
</div>
答案 0 :(得分：2)
如果使用array_column，则可以得到一个以状态为值，城市为键的平面数组。
然后使用asort对数组进行排序以保留键并按状态对其进行排序。
跟踪州的变化情况，并回显州下的城市。
$arr = array_column($locations, "state", "city");
asort($arr);
$prev = null;
foreach($arr as $city => $state){
if($state != $prev){
echo PHP_EOL . PHP_EOL . $state . PHP_EOL;
$prev = $state;
}
echo "---" . $city . PHP_EOL;
}
示例输出：
Georgia
---Atlanta
---Savannah
Georigia
---Augusta
Texas
---Huston
答案 1 :(得分：0)
实施步骤：
1）请循环遍历当前数组。
2）创建一个新的空白数组。
3）以country作为键附加到新数组，
4）以state作为键追加到新数组，
现在，循环遍历新数组，并在单独的行上打印国家和州。
<?php
$locations = Array(
Array
(
'id' => 14,
'post_id' => 319,
'location' => 'Atlanta, GA',
'address' => '161 Racetrack Rd., McDonough',
'city' => 'Atlanta',
'state' => 'Georgia',
'state_code' =>'GA',
'country' => 'USA',
'zipcode' => 30253,
'service_zipcode' => '',
'phone' => '',
'fax' => '',
'email' => '',
'facebook' => '',
'twitter' => '',
'linkedin' => '',
'gplus' => '',
'latitude' => '',
'longitude' => '',
'url' => '',
'created_at' => '2019-04-22 07:22:55',
'updated_at' => '2019-04-22 07:26:31',
),
Array
(
'id' => 16,
'post_id' => 321,
'location' => 'Augusta, Georigia',
'address' => '1446 Harper Street',
'city' => 'Augusta',
'state' => 'Georigia',
'state_code' => 'GA',
'country' => 'USA',
'zipcode' => '',
'service_zipcode' => '',
'phone' => '',
'fax' => '',
'email' => '',
'facebook' => '',
'twitter' => '',
'linkedin' => '',
'gplus' => '',
'latitude' => '',
'longitude' => '',
'url' => '',
'created_at' => '2019-04-22 07:29:33',
'updated_at' => '2019-04-22 07:32:25',
),
Array
(
'id' => 12,
'post_id' => 317,
'location' => 'Savannah, Georgia',
'address' => '834 Northside Dr. East, Statesboro',
'city' => 'Savannah',
'state' => 'Georgia',
'state_code' => 'GA',
'country' => 'USA',
'zipcode' => 30458,
'service_zipcode' => '',
'phone' => '',
'fax' => '',
'email' => '',
'facebook' => '',
'twitter' => '',
'linkedin' => '',
'gplus' => '',
'latitude' => '',
'longitude' => '',
'url' => '',
'created_at' => '2019-04-22 07:15:43',
'updated_at' => '2019-04-22 07:18:11',
)
);
$hierarchy = [];
if (! empty($locations)) {
foreach ($locations as $location) {
$hierarchy[$location['country']][$location['state']] = $location;
}
}
if (! empty($hierarchy)) {
foreach ($hierarchy as $country => $location) {
echo "<br/>" . $country;
if (! empty($hierarchy[$country])) {
foreach ($hierarchy[$country] as $state => $city) {
echo "<br/>--> " . $state;
echo "<br/>----> " . $city['city'];
}
}
}
}
输出：
USA
--> Georgia
----> Savannah
--> Georigia
----> Augusta
Where `USA` -> Country Name
Starting with `-->`: state name
Starting with `---->`: city name