UploadFile.php

public function uploadFile()
{
	$qfilesCount = count($_FILES['quesFiles']['name']);
	$afilesCount = count($_FILES['ansFiles']['name']);
	$quesImg = array();
	$ansImg = array();
	
	for($i = 0; $i < $qfilesCount; $i++)
	{
		if(!empty($_FILES['quesFiles']['name'][$i]))
		{
			$newfilename = $this->changeFileName($_FILES['quesFiles']['name'][$i]);

			$_FILES['quesFile']['name'] = $newfilename;
			$_FILES['quesFile']['type'] = $_FILES['quesFiles']['type'][$i];
			$_FILES['quesFile']['tmp_name'] = $_FILES['quesFiles']['tmp_name'][$i];
			$_FILES['quesFile']['error'] = $_FILES['quesFiles']['error'][$i];
			$_FILES['quesFile']['size'] = $_FILES['quesFiles']['size'][$i];

			$config = array(
				'upload_path' => 'assets/uploads/',
				'allowed_types' => "gif|jpg|png|jpeg",
				'overwrite' => TRUE
			);

			$this->load->library('upload', $config);
			$this->upload->initialize($config);
			if($this->upload->do_upload('quesFile'))
			{
	          $fileData = $this->upload->data();
	          $uploadData[$i]['file_name'] = $fileData['file_name'];
	          $uploadData[$i]['created'] = date("Y-m-d H:i:s");
	          $uploadData[$i]['modified'] = date("Y-m-d H:i:s");
	        }

			array_push($quesImg, $_FILES['quesFile']['name']);
		}
		
	}

	for($i = 0; $i < $afilesCount; $i++)
	{
		if(!empty($_FILES['ansFiles']['name'][$i]))
		{
			$newfilename = $this->changeFileName($_FILES['ansFiles']['name'][$i]);

			$_FILES['ansFile']['name'] = $newfilename;
			$_FILES['ansFile']['type'] = $_FILES['ansFiles']['type'][$i];
			$_FILES['ansFile']['tmp_name'] = $_FILES['ansFiles']['tmp_name'][$i];
			$_FILES['ansFile']['error'] = $_FILES['ansFiles']['error'][$i];
			$_FILES['ansFile']['size'] = $_FILES['ansFiles']['size'][$i];

			$config = array(
				'upload_path' => 'assets/uploads/',
				'allowed_types' => "gif|jpg|png|jpeg",
				'overwrite' => TRUE
			);
			$this->load->library('upload', $config);
			$this->upload->initialize($config);
			if($this->upload->do_upload('ansFile'))
			{
				$fileData = $this->upload->data();
				$uploadData[$i]['file_name'] = $fileData['file_name'];
				$uploadData[$i]['created'] = date("Y-m-d H:i:s");
				$uploadData[$i]['modified'] = date("Y-m-d H:i:s");
			}

			array_push($ansImg, $_FILES['ansFile']['name']);
		}
		
	}

	$choices = implode("%20", $this->input->post('fields'));
	$ques_img = implode("%20", $quesImg);
	$ans_img = implode("%20", $ansImg);

	$data = array(
		'question' => $this->input->post('question'),
		'choices' => $choices,
		'correct' => $this->input->post('correct'),
		'category' => $this->input->post('category'),
		'ques_img' => $ques_img,
		'ans_img' => $ans_img
	);

	$this->db->insert('questions', $data);		
	return ($this->db->affected_rows() != 1) ? false : true;
}