Populate PHP associative array using loop with mysql data - php

Question

I'm creating simple PHP for output data to apexcharts javascript charts. To make apexcharts usable output I need to provide x and y value of the graphs as JSON. below code, I wrote to output the expected JSON.
$data_arr = array();
global $mysqli_conn;
$result = $mysqli_conn->query("sql");
$sql_out = array();
$sql_out = $result->fetch_all(MYSQLI_ASSOC);
$num_rows = mysqli_num_rows($result);
if ($num_rows < 1){
echo "zero";
}else{
foreach($sql_out as $item) {
$data_arr['x'][] = $item['time'];
$data_arr['y'][] = $item['status_code'];
}
}
$test_arr = array(
array(
"name"=>"lock",
"data"=>array($data_arr),
)
);
echo json_encode($test_arr);
my expected json output is like below
[
{
"name": "lock",
"data": [
{
"x": "2019-05-30 07:53:07",
"y": "1470"
},
{
"x": "2019-05-29 07:52:27",
"y": "1932"
}
]
}
]
But when I request data from my code what I'm getting something like this
[
{
"name": "lock",
"data": [
{
"x": [
"2019-05-30 07:53:07",
"2019-05-29 07:52:27",
"2019-05-26 15:46:56",
"2019-05-25 07:39:24"
],
"y": [
"1470",
"1932",
"1940",
"1470"
]
}
]
}
]
How can I create my expected JSON result from PHP code?.

Answer 1

You're creating them on a seprate space. When you declare and push them, put them on one container:
foreach ($sql_out as $item) {
$data_arr[] = array(
'x' => $item['time'],
'y' => $item['status_code']
);
}
When you do this:
$data_arr['x'][] = $item['time'];
$data_arr['y'][] = $item['status_code'];
They are on a separate containers, x and y containers, therefore you get the wrong format, like the one you showed.
When you declare them as:
$data_arr[] = array(
'x' => $item['time'],
'y' => $item['status_code']
);
You're basically tellin to push the whole sub batches but together.