This is because you're re-assigning $dataPoints as a new array on each loop.

Change it to:

$dataPoints[] = array("x"=>$resp['friends_count'],"y"=>$resp ['statuses_count']);

This will append a new array to the end of $dataPoints

You're aaalmost there. Just add the level to the array creation :)

$levels = array('low', 'medium', 'high');
$attributes = array('fat', 'quantity', 'ratio', 'label');

foreach ($levels as $key => $level):
       foreach ($attributes as $k =>$attribute):
             $variables[$level][] = $attribute . '_' . $level; // changed $variables[] to $variables[$level][]
       endforeach;
endforeach;

echo '<pre>' . print_r($levels,1) . '</pre>';   
echo '<pre>' . print_r($variables,1) . '</pre>';  

Output

Array
(
    [low] => Array
        (
            [0] => fat_low
            [1] => quantity_low
            [2] => ratio_low
            [3] => label_low
        )

    [medium] => Array
        (
            [0] => fat_medium
            [1] => quantity_medium
            [2] => ratio_medium
            [3] => label_medium
        )

    [high] => Array
        (
            [0] => fat_high
            [1] => quantity_high
            [2] => ratio_high
            [3] => label_high
        )

)

My guess is your foreach loop looks like this:

$result = array();
foreach($members as $member) {
    $result['firstname'][] = $member['firstname'];
    $result['last_name'][] = $member['last_name'];
    //etc
}

And it should be something like this:

$result = array();
foreach($members as $member) {
    $result[] = array(
        'firstname' => $member['firstname'],
        'last_name' => $member['last_name'],
        'job' => $member['job'],
        'desc' => $member['desc'],
        'image_url' => $member['image_url']
    );
}

Update based on sample code:

The POST fields are arrays, so you have to make sure all fields are posted for every member, as the for loop is based on all fields having the same amount of values.

$fname = $_POST['first_name'];
$lname = $_POST['last_name'];
_POST['job'];
$desc  = $_POST['desc'];
$photo = $_POST['image_url'];

$memberdata = array();

// we iterate the firstname field and access the same indexes from the other fields. The $i starts with 0 and gets incremented until it iterated over all the firstnames
for(i < count($fname); $i++) {
    $memberdata[] = array(
        'first_name' => $fname[$i], // we access the firstname at the current index
        'last_name' => $lname[job[$i],
        'desc' => $desc[$i],
        'image_url' => $photo[$i]
    );
}

var_dump($memberdata);

You can use php's array_chunk method. Notice its use in modified code below:

if($query->num_rows() > 0):
    foreach($query->result() as $row):
        $data[$row->id] = $row->shortname;
    endforeach;

    $data = array_chunk($data, 2);

return $data;

if everything is okay with data, this code will be enough for building such array:

$comments = $issue_json->fields->comment->comments;
$result = array();

foreach ($comments as $comment) {
  $result[] = array(
    'comments_date' => convert_sql_time($comment->updated),
    'comments_displayName' => $comment->author->displayName,
    'comments_body' => $comment->body,
  );
}

print_r($result);

• if comment->comments is an array, there is no need to keep it's count separately;
• foreach is enough for iterating through the array and there is no need to keep separate variable for calculating array index;
• [] notation will automatically increase array index and assigning array directly will do the trick(i.e. will result to multi dim array)

Try this.

$j = -1;
$newArray = [];
foreach($items as $item){
    if ($item['SUBMODEL_NAME']) {
        $j++;
    }
    $newArray [$j][] = $item ;
}

Two good options:

If the todo_id is unique, let it be the key:

$js_arr[$row['todo_id']] = $row['todo_content'];

Or for a multi-dimensional array, needed if you have more than just todo_content:

$js_arr[] = array('todo_content' => $row['todo_content'], 'todo_id' => $row['todo_id']);

$sql = "select category.name,group_concat(images.image_name) from category inner join images on (category.id = images.category_id) group by category.name";
$table = mysql_query($sql);
$arr = array();
while($row = mysql_fetch_row($table))
{
    $row['image_name'] = explode(",", $row['image_name']);
    $arr[] = $row;
}

I don't think this is a restrict Wordpress question, but you might try

$args = array(
    'posts_per_page' => '-1',
    'post_type' => 'work',
    'orderby' => 'ID',
    'order' => 'DESC',
);

$data = array('work' => array());

$loop = new WP_Query($args);
if( $loop->have_posts() ):
    while( $loop->have_posts() ): $loop->the_post();
        $id = $loop->post->ID;

        $attachments=array();
        if(get_field('work')): 
           while(has_sub_field('work')):
              $attachment_id = get_sub_field('image');
              $caption = the_sub_field('caption');
              $image = wp_get_attachment_image_src( $attachment_id, 'work' );   
              $attachments[$attachment_id]=array("caption"=>$caption,"url"=>$image); 
           endwhile;    
        endif; 

        $data['work'][$id] = array(
            'title' => apply_filters( 'the_title', $loop->post->post_title ),
            'content' => apply_filters( 'the_content', $loop->post->post_content ),           
            'items'  => $attachments;  
        );
    endwhile;
endif;
wp_reset_postdata();