PDO fetchAll array to one dimensional - php

Question

this may be a simple question but am struggling to understand how to solve it. I have a form which allows the user to select either "custom" or "all" staff" to assign to a job.
If custom is selected the user selects staff by clicking each checkbox, I then insert these into a jobs table. This produces the array below (3, 1, 10 are the staff IDs)
Array
(
[0] => 3
[1] => 1
[2] => 10
)
If "all staff" is selected, I first query a select statement to get all the staff ID's from the staff table, and then insert these into the job table the same as above. However this produces the array :
Array
(
[0] => Array
(
[staffID] => 1
[0] => 1
)
[1] => Array
(
[staffID] => 23
[0] => 23
)
[2] => Array
(
[staffID] => 26
[0] => 26
)
[3] => Array
(
[staffID] => 29
[0] => 29
)
)
How can I convert the array above to the first array shown?
I'm using the code below to query the database to get all the staff ID's and then inserting them.
$select = $db->prepare("SELECT staffID FROM staff");
if($select->execute())
{
$staff = $select->fetchAll();
}
for($i = 0; $i<count($staff); $i++)
{
$staffStmt = $db->prepare("INSERT INTO staffJobs (jobID, userID) VALUES (:jobID, :staffID)");
$staffStmt->bindParam(':jobID', $jobID, PDO::PARAM_INT);
$staffStmt->bindParam(':staffID', $staff[$i], PDO::PARAM_INT);
$staffStmt->execute();
}
The first array inserts fine, however the last array inserts zeros for the staffID.
Any suggestions?
Thanks =).

Answer 1

Take a look at example 2 in the manual. In your first query you can use:
$staff = $select->fetchAll(PDO::FETCH_COLUMN, 0);
And your second array will have the same form as the first array.

Answer 2

If you print_r($staff[$i]) inside the for you would probably get
Array
(
[staffID] => 1
[0] => 1
)
which means you should use $staff[$i]['staffID'] instead.
The other alternative, which should work with your current code, is to use PDOStatement::fetchColumn() instead of fetchAll().

Answer 3

You need to give fetchAll a fetch style
$staff = $select->fetchAll(PDO::FETCH_NUM);
From this link