我有以下數據結構：Array( [0] => stdClass Object ( [id] => 1 [title] => Golf [manufacturer] => 1 ) [1] => stdClass Object ( [id] => 2 [title] => Focus [manufacturer] => 2 ) [2] => stdClass Object ( [id] => 3 [title] => Jazz [manufacturer] => ) [3] => stdClass Object ( [id] => 4 [title] => Passat [manufacturer] => 1 ) [4] => stdClass Object ( [id] => 5 [title] => Toureg [manufacturer] => 1 ) [5] => stdClass Object ( [id] => 6 [title] => Galaxy [manufacturer] => 2 ))我想這樣顯示它：<div class="container id1"> ID: 1 - Golf ID: 4 - Passat ID: 5 - Toureg</div><div class="container id2"> ID: 2 - Focus ID: 6 - Galaxy</div><div class="container"> ID: 3 - Jazz</div>所以我的視圖代碼將輸出我嘗試這樣做的上述數組：foreach ($cars as $car){ echo '<div class="container">'; if ($car->manufacturer) { echo '</div>'; echo '<div class="container id'. $car->manufacturer .'">'; echo $car->id . ' - ' . $car->title; echo '</div>'; } else { echo '</div>'; echo '<div class="container">'; echo $car->id . ' - ' . $car->title; echo '</div>'; }}但這會輸出幾個空<div class="container"></div>元素，而且只有<div class="container">ID: 1 - Golf</div>, 不像所需的輸出。如何使用此數組獲得所需的輸出？請注意，Jazz 沒有制造商集，因此<div>類不應該有 idX 集，其中 X 是制造商的 ID 值。
1 回答
慕桂英3389331
TA貢獻2036條經驗 獲得超8個贊
您需要做的第一件事是根據您可以使用的制造商對數組進行排序usort，按值對沒有制造商的條目進行排序id。然后你可以遍歷汽車，檢查制造商是否與前一輛汽車相同，如果是，則輸出一個新<div>元素并關閉前一個（如果需要）：
// sort based on manufacturer
usort($cars, function ($a, $b) {?
? ? if (!$a->manufacturer) {
? ? ? ? // if both null, sort by id
? ? ? ? if (!$b->manufacturer) return $a->id - $b->id;
? ? ? ? // otherwise sort null values last
? ? ? ? return 1;
? ? }
? ? if (!$b->manufacturer)
? ? ? ? // sort null values last
? ? ? ? return -1;
? ? return $a->manufacturer - $b->manufacturer;
});
$lastmfg = 0;
foreach ($cars as $car) {
? ? if (!$car->manufacturer || $car->manufacturer != $lastmfg) {
? ? ? ? if ($lastmfg !== 0) echo "</div>\n";
? ? ? ? echo '<div class="container'. ($car->manufacturer ?? ' id' . $car->manufacturer : '') .'">'. "\n";
? ? }
? ? echo 'ID: ' . $car->id . ' - ' . $car->title . "\n";
? ? $lastmfg = $car->manufacturer;
}
echo "</div>\n";
輸出（用于擴展演示）：
<div class="container id1">
ID: 1 - Golf
ID: 4 - Passat
ID: 5 - Toureg
</div>
<div class="container id2">
ID: 2 - Focus
ID: 6 - Galaxy
</div>
<div class="container id3">
ID: 9 - Phoenix
</div>
<div class="container">
ID: 3 - Jazz
</div>
<div class="container">
ID: 7 - Falcon
</div>
<div class="container">
ID: 8 - Commodore
</div>
<div class="container">
ID: 10 - Cressida
</div>
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