How to properly generate URL with more then one argument - codeigniter

Question

How to generate URL in my current code, so I can pass the values to my directions function.
This is my code for displaying markers on map for each company:
$n = 0;
foreach ($firm as $f) {
if ($f->active == 1 && in_array($f->skd_n, $dejavnost) && $f->lat != 0) {
$lat_f = $f->lat;
$lng_f = $f->lng;
$distance = (($this->distance($lat, $lng, $lat_f, $lng_f)) * 1000);
if ($distance <= $rad && $n <= 199) {
$marker = array();
$marker['position'] = "$lat_f, $lng_f";
if ($f->phone != 0) {
$marker['infowindow_content'] = '<div class="info_window">' . "$f->title" . '<br/>' .
'<div class="pin_icon"></div>' .
"$f->address" . '<br/>' .
'<div class="phone_icon"></div>' .
"$f->phone" . '<br/>' .
//generate URL with 4 arguments
'DIRECTION' .
'</div><br/>';
}else{
$marker['infowindow_content'] = '<div class="info_window">' . "$f->title" . '<br/>' .
'<div class="pin_icon"></div>' .
"$f->address" . '</div>';
}
$marker['animation'] = 'DROP';
$marker['zIndex'] = '0';
$marker['icon'] = '../images/pin-map-red.png';
$this->googlemaps->add_marker($marker);
$n++;
}
}
}
I want to add anchor to next function, where question marks are and use variables (coordinates) as arguments:
function direction($lat, $lng, $lat_f, $lng_f){
$config['places'] = TRUE;
$config['placesAutocompleteInputID'] = 'event_location';
$config['placesAutocompleteBoundsMap'] = TRUE;
$config['zoom'] = 'auto';
$config['center'] = 'auto';
$config['directions'] = TRUE;
$config['directionsStart'] = "$lat, $lng";
$config['directionsEnd'] = "$lat_f, $lng_f";
$config['directionsDivID'] = 'directions';
$this->googlemaps->initialize($config);
$data['map'] = $this->googlemaps->create_map();
$this->load->view('header', $data);
$this->load->view('domov_view', $data);
$this->load->view('footer');
}
How can I use values in second function (direction) from first?
Thank you!

Answer 1

You could pass the arguments in url and fetch them inside your direction method via $_GET method
Example:
You could generate link like that
DIRECTION
So your function would look like this:
$n = 0;
foreach ($firm as $f) {
if ($f->active == 1 && in_array($f->skd_n, $dejavnost) && $f->lat != 0) {
$lat_f = $f->lat;
$lng_f = $f->lng;
$distance = (($this->distance($lat, $lng, $lat_f, $lng_f)) * 1000);
if ($distance <= $rad && $n <= 199) {
$marker = array();
$marker['position'] = "$lat_f, $lng_f";
if ($f->phone != 0) {
$marker['infowindow_content'] = '<div class="info_window">' . "$f->title" . '<br/>' .
'<div class="pin_icon"></div>' .
"$f->address" . '<br/>' .
'<div class="phone_icon"></div>' .
"$f->phone" . '<br/>' .
'DIRECTION' .
'</div><br/>';
}else{
$marker['infowindow_content'] = '<div class="info_window">' . "$f->title" . '<br/>' .
'<div class="pin_icon"></div>' .
"$f->address" . '</div>';
}
$marker['animation'] = 'DROP';
$marker['zIndex'] = '0';
$marker['icon'] = '../images/pin-map-red.png';
$this->googlemaps->add_marker($marker);
$n++;
}
}
}
And fetch them this way in directions function
function direction(){
$lat = $this->input->get('lat');
$lng = $this->input->get('lng');
$lat_f = $this->input->get('lat_f');
$lng_f = $this->input->get('lng_f');
$config['places'] = TRUE;
$config['placesAutocompleteInputID'] = 'event_location';
$config['placesAutocompleteBoundsMap'] = TRUE;
$config['zoom'] = 'auto';
$config['center'] = 'auto';
$config['directions'] = TRUE;
$config['directionsStart'] = "$lat, $lng";
$config['directionsEnd'] = "$lat_f, $lng_f";
$config['directionsDivID'] = 'directions';
$this->googlemaps->initialize($config);
$data['map'] = $this->googlemaps->create_map();
$this->load->view('header', $data);
$this->load->view('domov_view', $data);
$this->load->view('footer');
}
P.S.: If you are sending langitude and longitude via url you will probably have problems with sending disallowed chars via url (dot(.)).
You can configure allowed url chars in config file
$config['permitted_uri_chars'] = 'a-z 0-9~%.:_=+-'

Answer 2

You can extend url helper. Add function some:
create_url('controller/action', [
'getParam1' => 'value1',
'getParam2' => 'value2',
'getParam3' => 'value3',
]);
And it generate http://base.url/controller/action?getParam1=value&getParam2=value2&getParam3=value3
or use
http://www.codeigniter.com/userguide2/libraries/uri.html
create link $this->uri->assoc_to_uri()
parse link $this->uri->uri_to_assoc()