Create Array from Mysql data for Flot - php

Question

I have a problem in that I can't get an array into an array.
The outcome should look like this:
$data=array(
array(
'label' => 'Totals',
'color' => '#745fa4',
'data' =>
array(
array('01/01/2015', 125),
array('02/01/2015', 148),
array('03/01/2015', 42),
array('04/01/2015', 115),
array('05/01/2015', 45),
array('06/01/2015', 77),
array('07/01/2015', 59)
)
),
);
I currently have this but can't get it into the correct format:
$result = mysqli_query($con,"SELECT * FROM table ORDER BY id DESC LIMIT 28");
$chartdata = array();
while($row = $result->fetch_assoc()) {
$chartdata[] .= array($row["date"]. ", " . $row["total"]);
}
$data=array(
array(
'label' => 'Totals',
'color' => '#745fa4',
'data' => $chartdata
)
);
If someone could help me out that would be fantastic.

Answer 1

1) .= this means assignment with string concatenation. you should push array into parent array
2) inside child array have two values not single string so use , between two value not string concatenation ","
$chartdata[] .= array($row["date"]. ", " . $row["total"]);
to
$chartdata[] = array($row["date"], $row["total"]);

Answer 2

You have a superfluous dot here:
# ⇓
$chartdata[] .= array($row["date"]. ", " . $row["total"]);
To push new item into an array one should use $array[] = $item:
$chartdata[] = array($row["date"]. ", " . $row["total"]);
Dot is used to concatenate strings. Hope it helps.

Answer 3

Remove the dot.
<?php
$result = mysqli_query($con,"SELECT * FROM table ORDER BY id DESC LIMIT 28");
$chartdata = array();
while($row = $result->fetch_assoc()) {
$chartdata[] = array($row["date"], $row["total"]); // Remove the dot
}
$data=array(
array(
'label' => 'Totals',
'color' => '#745fa4',
'data' => $chartdata
)
);