如何在PHP中創建一個哈希頂級列表？

我有一個表「上崗」

這個表包含3個字段（ID，文本，哈希）

這樣

id => 1 
text => i'm from #us 
hash => ,us 

id => 2 
text => i #love #us 
hash => ,love ,us 

id => 3 
text => i will travel to #us cus i #love it 
hash => ,us ,love 

id => 4 
text => i will go to #us #now 
hash => ,us ,now

數據我想這樣

的數據顯示

top hash

us 
love 
now

來源

2013-08-02 Mahmoud Samy

什麼不在你的代碼中工作？ – user20232359723568423357842364

你不需要像這樣的設置。你應該有這樣的設置：'posts（id，text）'，'tags（id，tag）'和'relationships（id，post_id，tag_id）''。然後，您可以通過'tag_id DESC'對'關係'表進行排序，並拉動最常用的3個。 –

當沒有信息存儲但不需要代理主鍵時，沒有理由使用「標籤」表。「關係」表也不需要「id」列; 'post_id，tag'本身就是主鍵。看起來你已經養成了爲每個表添加「id」列的習慣，即使它不需要。 –

<?php 
$sql = new MySQLi('localhost', 'root', '', 'database'); 
    // A MySQLi connection 

/* Database setup: 
`posts` 
    `id` 
    `text` 

`tags` 
    `tag` 
    `post_id` 
*/ 

function add_post ($text, $tags = array()) { 
    global $sql; 

    $sql->query('INSERT INTO `posts` (`text`) VALUES ("'.$sql->real_escape_string($text).'");'); 
     // Insert the post into the posts table 
    $postID = $sql->insert_id; 
     // Capture its id 

    if (count($tags) != 0) { 
     foreach ($tags as &$tag) { 
      $tag = $sql->real_escape_string($tag); 
     } 
     unset($tag); 
      // Escape every tag 

     $sql->query('INSERT INTO `tags` (`tag`, `post_id`) VALUES ("'.implode('", '.$postID.'), ("', $tags).'", '.$postID.');'); 
      // Insert the tags associated with this post as records in the tags table 
    } 
} 

// If/when you write update_post and delete_post functions, you will need to manage the tags associated with them as well 
// Probably it's best to use a relational system like InnoDB 

function get_top_tags ($num = 3) { 
    global $sql; 

    $result = $sql->query('SELECT `tag`, COUNT(`tag`) AS `frequency` FROM `tags` GROUP BY `tag` ORDER BY `frequency` DESC LIMIT '.(int) $num.';'); 
     // Get the tags in order of most to least frequent, limited to $num 

    $tags = array(); 
    while ($row = $result->fetch_assoc()) { 
     $tags[] = $row['tag']; 
    } 
     // Turn them into an array 
    return $tags; 
} 

// Example usage: 
add_post('This is a new post.', array ('this', 'post', 'new')); 
add_post('This is an old post.', array ('this', 'post')); 
add_post('That is a medium-aged post.', array ('post')); 
?> 
<h1>Top Tags</h1> 
<ol> 
<?php 
foreach (get_top_tags(3) as $tag) { 
?> 
    <li><?php echo $tag; ?></li> 
<?php 
} 
?> 
</ol> 
<!-- Should print 
1. post 
2. this 
3. new 
-->

讓我知道你是否需要幫助。未經測試的代碼，所以不知道它是否有效。

來源

2013-08-02 21:01:30

如何在PHP中創建一個哈希頂級列表？

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