PHP PDO：fetchAll（PDO :: FETCH_COLUMN | PDO :: FETCH_GROUP）不起作用

Question

I have a question about PDO in PHP:

I'm trying to fetch a column from my mysql database, indexed by the id of each row... Now php.net has an example on how to do it: http://www.php.net/manual/en/pdostatement.fetchall.php (example #3)

    <?php
$insert = $dbh->prepare("INSERT INTO fruit(name, colour) VALUES (?, ?)");
$insert->execute(array('apple', 'green'));
$insert->execute(array('pear', 'yellow'));

$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();

/* Group values by the first column */
var_dump($sth->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
?>

But this doesn't seem to work for me... All i get is:

array {

   [id1] => null;
   [id2] => null;
   [id3] => null;
   ...

}

Even when i copy the exact same code, and only edit the table name etc. Does anyone know what can cause this problem?

Answer 1

As you can see from the output in the example you linked to, it doesn't work the way you expect.

So, just loop over result using while fetch, storing resul in array manually and set whatever index you like.