Passing SQL data in codeigniter to highcharts with JSON - codeigniter

Question

I am having trouble passing SQL data from my controller to my view. I have verified the information shows up from my model. I don't know JSON very well but I'm trying to learn. My goal is to populate a chart with two fields that are just numbers into this highcharts javascript. Please help, thank you!
Controller
function dashboard() {
// Tickets in Queue
$query = $this->mhedash_model->maint_pending_tickets();
$result3 = $query->result_array();
$this->table->set_heading('Work Number', 'Vehicle Number','Submit Date','Submit Time');
$data['table']['Vehicle in Queue'] = $this->table->generate_table($result3);
// Active Tickets
$query = $this->mhedash_model->select_active();
$result = $query->result_array();
$this->table->set_heading('Service Number','Start Date','Mechanic','Vehicle Number','Description','Type');
$data['table']['Vehicles Actively Being Worked On'] = $this->table->generate_table($result);
// Tickets Waiting On Parts
$query = $this->mhedash_model->select_pending_parts();
$result2 = $query->result_array();
$this->table->set_heading('Service Number','Start Date','Mechanic','Vehicle Number','Description','Type');
$data['table']['Waiting For Parts'] = $this->table->generate_table($result2);
//Graph - Availble Highreaches
$query = $this->mhedash_model->graph_available_hr();
$result4 = $query->result_array();
$data['row'][''] = $this->table->generate_table($result4);
$query = $this->mhedash_model->graph_available_dt();
$result5 = $query->result_array();
$data['row'][''] = $this->table->generate_table($result5);
$series_data[] = array('name' => 'available', 'data' => (int)$result4);
$series_data[] = array('name' => 'not_available', 'data' => (int)$result5);
$this->view_data['series_data'] = json_encode($series_data, JSON_NUMERIC_CHECK);
// Load view
$data['page_title'] = 'MHE Dashboard';
$data['main_content'] = 'mhe/mhe_dashboard_view';
$data['array'] = $result;
$data['array2'] = $result2;
$data['array3'] = $result3;
print json_encode($series_data);
//echo json_encode($series_data, JSON_NUMERIC_CHECK);
return $this->load->view('includes/template',$data);
}
View that has the highcharts javascript
var chart;
$(function () {
$('#container').highcharts({
chart: {
type: 'column'
},
xAxis: {
categories: ['one', 'two']
},
plotOptions: {
series: {
allowPointSelect: true
}
},
series: [{
data: [<?php echo join($series_data, ',') ?>]
}]
});
// the button action
$('#button').click(function () {
var chart = $('#container').highcharts(),
selectedPoints = chart.getSelectedPoints();
if (chart.lbl) {
chart.lbl.destroy();
}
chart.lbl = chart.renderer.label('You selected ' + selectedPoints.length + ' points', 100, 60)
.attr({
padding: 10,
r: 5,
fill: Highcharts.getOptions().colors[1],
zIndex: 5
})
.css({
color: 'white'
})
.add();
});
});
</script>
Also, this is what prints when I print son_encode for my $series_data
[{"name":"available","data":1},{"name":"not_available","data":1}]