如何将PHP数组表示为逗号分隔的字符串？ [重复]

问题描述：

Possible Duplicate:
PHP/MYSQL using an array in WHERE clause

I have an array with ID values [1,5,2,6,7...] and I need to use that in a MySQL item_id IN (1,5,2,6,7...) statement to select only rows with an ID listed in the array. How can I go about converting the $arrIDs to something that I can insert into my SQL query?

EDIT- context of the call:

if(!IsNullOrEmptyString($_GET["view_playlist"])) {
        session_destroy();
    }
    $id_list = implode(",", $_SESSION("playlist"));
    $sql = 'SELECT t.track_id, t.track_title, t.track_num, al.album_title, g.genre_name, a.artist_name, t.length, t.track_rating '.
    'FROM track t, genre g, artist a, album al '.
    'WHERE t.track_id IN('.$id_list.' AND t.genre = g.genre_id AND t.artist = a.artist_id AND t.album = al.album_id';

可能重复： strong>
使用WHERE子句中的数组的PHP / MYSQL p>
我有一个ID值为[1,5,2,6,7 ...]的数组，我需要在MySQL item_id IN中使用它（1,5 ，2,6,7 ...）语句只选择具有数组中列出的ID的行。如何将$ arrID转换为可以插入SQL查询的内容？ p>

调用的EDIT-上下文： p>

if（！IsNullOrEmptyString（$ _ GET [“view_playlist”]））{ session_destroy（）; } $ id_list = implode（“，”，$ _SESSION（“playlist”））; $ sql ='SELECT t.track_id，t.track_title，t.track_num，al.album_title，g.genre_name，a.artist_name，t.length，t.track_rating'。 'FROM track t，genre g，artist a，album al'。 'WHERE t.track_id IN（'。$ id_list。'AND t.genre = g.genre_id AND t.artist = a.artist_id AND t.album = al.album_id'; code> pre> div>

答

Use implode();

$ids = implode(',', $your_array);

答

If you're using PDO or mysqli (which you should, as the mysql_ functions are antiquated and should be abandoned), then you'll want to construct a parameterized query using the number of elements in your array to match the number of ?'s in your SQL.

Here's an example in PDO:

$ids = array(1, 2, 3, 4);

try {
    $dbh = new PDO("mysql:host=localhost;dbname=mydbname", 'username', 'password');
} catch(PDOException $e) {
    die($e->getMessage());
}

$inClause = trim(str_repeat('?, ', count($ids)), ', ');
$stm = $dbh->prepare('SELECT * FROM mytable WHERE id IN ('.$inClause.')');
$stm->execute($ids);

// resulting SQL: SELECT * FROM mytable WHERE id IN (?, ?, ?, ?)

如何将PHP数组表示为逗号分隔的字符串？ [重复]

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