Selecting variable and storing into multi-dimentional array - php

Question

I understand how multi-dimentional array works but iam new to it.
eg.
$arrayAns = array( subject => "he"),
array( subject => "I"),
array( subject => "they");
What I am trying to do is, get a variable from database and store it in the array.
$query = "SELECT subject FROM #__wordBank ORDER BY RAND() LIMIT 1";
$db->setQuery($query);
$rows=$db->loadObjectList();
$arrayAns = array( subject => "$rows")
Is that the way to do it?

Answer 1

Try this:
If the results from database are stored in rows:
$newArray = array();
foreach($rows as $key=>$value) {
$newArray[] = $value;
}
Here, all the variables in $value would be stored into the newArray.
Also, see array_push

Answer 2

Almost! But not quite
Here is how I would go about this:
$arrayAns = array(
array('subject' => "he"),
array('subject' => "I"),
array('subject' => "they")
);
$query = "SELECT subject FROM #__wordBank ORDER BY RAND() LIMIT 1";
$db->setQuery($query);
$rows=$db->loadObjectList();
$arrayAns[] = array('subject' => $rows);

Answer 3

Depending on what DB API are you using you may have an option to retrieve the data as a multidimensional array automatically. Check if $rows->toArray() is possible or something like that.
Otherwise not the most optimal, but easy and clean way is to foreach through your $rows list and build the array you want.
Btw, the array you have defined on top is defined like this in PHP:
$myArray = array(
array(
'subject' => 'he'
),
array(
'subject' => 'I'
),
array(
'subject' => 'they'
)
);

Answer 4

Change you syntax to look like this (you also had some syntax errors) -
// original multidimensional array
$arrayAns = array(
array( "subject" => "he"),
array( "subject" => "I"),
array( "subject" => "they")
);
// execute query
$query = "SELECT subject FROM #__wordBank ORDER BY RAND() LIMIT 1";
$db->setQuery($query);
$rows=$db->loadObjectList();
Now what we want to do is add another element to your original array. You can use the short hand [] syntax to push another element on to the top of the array.
$arrayAns[] = array('subject'=> $rows['subject']);
That line is functionally identical to this one -
array_push($arrayAns, array('subject'=> $rows['subject']));