unable to post json data , response message is SyntaxError: unexpected token < - php

Question

also i did not get any console error and i check network tab i get 200 ok message that means data is posted.. please help
Here is jquery code
$(document).ready(function() {
$('#mc_subscribe').submit(function() {
$('#response').html('form submitting....');
var form = $(this);
$.ajax({
url: $(this).prop('action'),
type: 'POST',
dataType: 'json',
data: form.serialize()
}).done(function(data){
if (data.success == true){
$('#mc_subscribe')[0].reset();
$('#response').addClass('alert-success').removeClass('alert-danger').html(data.message);
window.setTimeout(function() {
window.location.href = data.redirectURL;
}, 2000);
} else{
$('#response').addClass('alert-danger').removeClass('alert-success').html(data);
}
}).fail(function( jqXHR, textStatus, data ) {
alert( "Request failed: " + data );
});;
return false;
});
});
Here is my codignitor controller code
class Subscribe extends CI_Controller {
private $data;
public function index() {
if ($this->input->is_ajax_request()){
$result = $this->_subscribe();
echo json_encode($result);
exit;
}
$this->load->view('header');
$this->load->view('pages/subscribe', $this->data);
$this->load->view('footer');
}
private function _subscribe(){
$success = true;
$redirectURL = base_url() + '/pricing';
if(!$this->input->post('FNAME')){
$message = "No Full Name provided";
$success = false;
}
if( empty($this->input->post('EMAIL')) || !preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*#[a-z0-9-]+(\.[a-z0-9-]+)*$/i", $_POST['EMAIL']) ){
$message = "No Email address provided";
$success = false;
}
if($success && !$this->input->post('MOBILE')){
$message = "No Phone Number provided";
$success = false;
}
if($success && !$this->input->post('DAYTIME')){
$message = "No Day & Time provided";
$success = false;
}
if ($success){
$this->load->library('Mcapi', array(
'apikey' => $this->config->item('mailchimp_key')
));
$api = new Mcapi($this->config->item('mailchimp_key'));
$list_id = $this->config->item('mailchimp_list_id');
$merge_vars = Array(
'FNAME' => $this->input->post('FNAME'),
'MOBILE' => $this->input->post('MOBILE'),
'DAYTIME' => $this->input->post('DAYTIME')
);
if($api->listSubscribe($list_id, $_POST['EMAIL'], $merge_vars, '') === true) {
// It worked!
$message = 'Success!';
} else {
$success = false;
// An error ocurred, return error message
$message = 'Error: ' . $api->errorMessage;
}
}
return array('message' => $message, 'success' => $success, 'redirectURL' => $redirectURL);
}
}
and here is HTML form
<div class="container">
<div class="col-md-12">
<form id="mc_subscribe" class="form-horizontal" action="http://localhost/CI-2/Subscribe/" method="post">
<fieldset>
<!-- Form Name -->
<legend>SUBSCRIBE</legend>
<div class="form-group">
<label class="col-md-4 control-label" for=""></label>
<div class="col-md-4">
<input id="" name="FNAME" type="text" placeholder="Full Name" class="form-control input-md" required="">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for=""></label>
<div class="col-md-4">
<input id="" name="EMAIL" type="email" placeholder="Email" class="form-control input-md" required="">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for=""></label>
<div class="col-md-4">
<input id="" name="MOBILE" type="text" placeholder="Phone Number" class="form-control input-md" required="">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for=""></label>
<div class="col-md-4">
<input id="" name="DAYTIME" type="text" placeholder="Day & Time" class="form-control input-md" required="">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for=""></label>
<div class="col-md-8">
<input type="submit" name="submit" class="btn btn-success" value="SUBSCRIBE">
</div>
</div>
</fieldset>
</form>
<p id="response" class="alert text-center" align="center"></p>
</div>
</div>

Answer 1

change this below line
return array('message' => $message, 'success' => $success, 'redirectURL' => $redirectURL);
TO
$data = array();
$data['message'] = $message ;
$data['success'] = $succcess;
$data['redirectURL'] = $redirectURL;
return json_encode($data);
in your controller.
it seems you are not returning the data in the json format,