如何從數組中刪除重複的單詞？

Question

我有翻出文本字符串數據庫查詢

$descriptionsQuery = mysql_query("select prob_text from opencall where logdatex between $OneHourAgo and $TimeNow ORDER by callref DESC") or die(mysql_error()); 
$descriptions = array(); 

while ($row = mysql_fetch_assoc($descriptionsQuery)){ 
$descriptions[] = $row['prob_text']; 
} 
//put all the strings together with a space between them 
$glue = implode (" ",$descriptions); 

什麼，我想幫助的是......之前「的說明。[]」被「粘」是一個很長的字符串，我我想要刪除任何重複的單詞。一旦他們粘在一起，我就依靠每個原始描述中有重複的單詞。這很難解釋，這裏是我的意思的一個例子。 2個用戶輸入一些文本，例如 用戶1："I have an issue with Leeds server. I am in Leeds" 用戶2："Margaret in Leeds has a problem, please call margaret"。因此，我希望User1在最終粘貼的字符串中只有1個「Leeds」，User2只有1個margaret，但是兩個用戶都提到了「Leeds」，所以我希望那裏有兩次膠粘字符串，每個用戶一次。這可能嗎？任何幫助讚賞。

Answer 1

你可以用$newarray = array_unique($oldarray)來做到這一點。

首先爆炸你的每一行以得到一個數組。使用array_unique()刪除重複項。然後爆破你的每一行，然後爆碎所有的行。

$descriptionsQuery = mysql_query("select prob_text from opencall where logdatex between $OneHourAgo and $TimeNow ORDER by callref DESC") or die(mysql_error()); 
$descriptions = array(); 

while ($row = mysql_fetch_assoc($descriptionsQuery)){ 
    $tmp = explode(' ', $row['prob_text']); 
    $tmp = array_unique($tmp); 
    // or case insensitive 
    // $tmp = array_intersect_key($array,array_unique(array_map(strtolower,$array))); 
    $descriptions[] = implode(' ', $tmp); 
} 
//put all the strings together with a space between them 
$glue = implode (" ",$descriptions); 

http://de3.php.net/function.array-unique

如果你想刪除一個不區分大小寫的方式重複，你必須改變的，而第二行。我在這裏找到提示： Best solution to remove duplicate values from case-insensitive array

Answer 2

更好的是在查詢中完成它。

你可以做類似

SELECT DISTINCT prob_text FROM opencall WHERE logdatex BETWEEN $OneHourAgo AND $TimeNow ORDER BY callref DESC 

這隻會在你的數據庫中選擇的話一次，這樣你就不會選擇任何重複。

http://dev.mysql.com/doc/refman/5.0/en/distinct-optimization.html

Answer 3

使用array_unique。或者在查詢

$descriptionsQuery = mysql_query("select prob_text from opencall where logdatex between $OneHourAgo and $TimeNow ORDER by callref DESC") or die(mysql_error()); 
$descriptions = array(); 

while ($row = mysql_fetch_assoc($descriptionsQuery)){ 
$descriptions[] = $row['prob_text']; 
} 

//remove duplicates: 
$descriptions = array_unique($descriptions); 

//put all the strings together with a space between them 
$glue = implode (" ",$descriptions); 

Answer 4

好像使用array_walk和anonymous functions的好時機使用DISTINCT。這將過濾掉所有的重複單詞，在一個單一的消息，忽略大小寫：

// $chat is the db result array 
foreach($chat as &$msg) { 
    $final = []; 
    array_walk(str_word_count($msg, 1), function($word) use (&$final) { 
     if (!in_array(strtolower($word), array_map('strtolower', $final))) { 
      $final[] = $word; 
     } 
    }); 
    $msg = implode(' ', $final); 
});   
$filtered = implode(' ', $chat); 

注意使用str_word_count()而非explode()。我沒有在生產環境中測試這個，但它會去掉基本的標點符號（'和-除外）。當您嘗試創建標籤雲時可能會很有用。