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Question

我正在创建一个＆＃34;固定＆＃34;我的论坛的功能，我正在寻找一种方法，将我的固定主题放在数组的开头，以便它们是＆＃34;卡住＆＃34;到页面顶部。

如果主题未固定，则topic_pinned=NULL如果已固定，则为topic_pinned=0。

数组按topic_updated排序。固定主题需要按topic_updated排在页面顶部，然后在固定主题下是非固定主题，也按topic_updated排序。

主题数组（$forum_topic_results）：

Array
(
    [0] => Array
        (
            [topic_id] => 4
            [topic_subject] => Test Subject #4
            [topic_date] => 2015-09-10 18:34:18
            [topic_by] => 1
            [topic_pinned] => 
            [topic_updated] => 2015-09-10 20:37:22
        )

    [1] => Array
        (
            [topic_id] => 3
            [topic_subject] => Test Subject #3
            [topic_date] => 2015-08-22 09:24:40
            [topic_by] => 1
            [topic_pinned] => 0
            [topic_updated] => 2015-09-04 22:02:31
        )

    [2] => Array
        (
            [topic_id] => 2
            [topic_subject] => Test Subject #2
            [topic_date] => 2015-08-15 10:56:00
            [topic_by] => 1
            [topic_pinned] => 
            [topic_updated] => 2015-09-04 19:45:32
        )

    [3] => Array
        (
            [topic_id] => 1
            [topic_subject] => Test Subject #1
            [topic_date] => 2015-08-30 19:48:17
            [topic_by] => 1
            [topic_pinned] => 0
            [topic_updated] => 2015-09-03 00:44:38
        )
)

PHP：

/**
 * getAllTopics
 *
 * Retreives the topics of the chosen category from the `forum_topics` table.
 *
 * @param   $cat_id
 * @access  public
 */
public function getAllTopics($cat_id=NULL)
{
    $database=$this->database;

    $database->query('SELECT topic_id, topic_subject, topic_date, topic_by, topic_pinned, topic_locked FROM forum_topics WHERE topic_cat = :catid ORDER BY topic_updated DESC', array(':catid' => $cat_id));
    $result = $database->statement->fetchAll(PDO::FETCH_ASSOC);

    return $result;
}

# Get topics
$forum_topic_results = $this->getAllTopics($_GET['cat']);
foreach($forum_topic_results as $forum_topic_row)
{
    # Get user's username.
    $topic_by=SearchUser($forum_topic_row['topic_by']);

    $data.='<tr>'.
        '<td>'.
            '<h3><a href="'.$_SERVER['PHP_SELF'].'?action=forum_posts&topic='.$forum_topic_row['topic_id'].'">'.$forum_topic_row['topic_subject'].'</a></h3>'.
            'by '.$topic_by['username'].' on '.date('D M d, Y g:i a', strtotime($forum_topic_row['topic_date'])).
        '</td>'.
    '</tr>';
}

我想要的结果：

Array
(
    [0] => Array
        (
            [topic_id] => 3
            [topic_subject] => Test Subject #3
            [topic_date] => 2015-08-22 09:24:40
            [topic_by] => 1
            [topic_pinned] => 0
            [topic_updated] => 2015-09-04 22:02:31
        )

    [1] => Array
        (
            [topic_id] => 1
            [topic_subject] => Test Subject #1
            [topic_date] => 2015-08-30 19:48:17
            [topic_by] => 1
            [topic_pinned] => 0
            [topic_updated] => 2015-09-03 00:44:38
        )

    [2] => Array
        (
            [topic_id] => 4
            [topic_subject] => Test Subject #4
            [topic_date] => 2015-09-10 18:34:18
            [topic_by] => 1
            [topic_pinned] => 
            [topic_updated] => 2015-09-10 20:37:22
        )

    [3] => Array
        (
            [topic_id] => 2
            [topic_subject] => Test Subject #2
            [topic_date] => 2015-08-15 10:56:00
            [topic_by] => 1
            [topic_pinned] => 
            [topic_updated] => 2015-09-04 19:45:32
        )
)

Answer 1

这应该有效：

<?php
$finalArr = $forum_topic_results;
foreach ($finalArr as $key => $row) {
    $topic_pinned[$key] = $row['topic_pinned'];
}
array_multisort($topic_pinned, SORT_DESC, $finalArr);
return $finalArr;
?>

有关array_multisort：array_multisort

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