Validation of an API in codeigniter not working properly - php

Question

I am writing an API in codeigniter. I am validating the fields it has with codeigniter built in function but somehow it's not working as it should.
public function check_validation()
{
$this->load->helper(array('form', 'url'));
$this->load->library('form_validation');
$firstname = mysql_real_escape_string($this->input->post('firstname'));
$lastname = mysql_real_escape_string($this->input->post('lastname'));
$email = mysql_real_escape_string($this->input->post('email'));*/
//$firstname = 'Numaan';
//$lastname = 'sheikh';
//$email = 'test#test.com';
$this->form_validation->set_rules('firstname', 'Username', 'required');
$this->form_validation->set_rules('email', 'Email', 'required');
if ($this->form_validation->run() == FALSE)
{
$finalResult = array('code' => 100,
'msg'=>'Field Emsdsdspty.',
'data' => array()
);
}
else
{
$finalResult = array('code' => 100,
'msg'=>'Validation Successful.',
'data' => array()
);
}
echo json_encode($finalResult);
}
I am trying to get the posted values but it is not working properly.then i also tried to assign the values to the variables and then passed through the validation it also did not work.

Answer 1

Try this (i not testing)
function check_validation()
{
$this->load->helper(array('form', 'url'));
$this->load->library('form_validation');
//default result
$finalResult = array('code' => 500, 'msg' => 'Unknow Error', 'data' => array());
if($this->input->post()) {
//set validaton
$this->form_validation->set_rules('firstname', 'Username', 'trim|strip_tags|required');
$this->form_validation->set_rules('lastname', 'Lastname', 'trim|strip_tags|required');
$this->form_validation->set_rules('email', 'Email', 'trim|strip_tags|required');
//check form
if($this->form_validation->run() == TRUE) {
$finalResult = array('code' => 200, 'msg' => 'Success', 'data' => array());
}else {
$finalResult = array('code' => 400, 'msg' => validation_errors(), 'data' => array());
}
}
echo json_encode($finalResult);
}
ps. api status code: http://www.restapitutorial.com/httpstatuscodes.html