Function to get an email using Sendgrid Parse API and save attachments using CodeIgniter

codeigniter_sengrid_parse_api_upload.php

<?php 
# CI Reference: http://codeigniter.com/user_guide/libraries/file_uploading.html
# SendGrid Reference: http://docs.sendgrid.com/documentation/api/parse-api-2/

public function input(){	
	//file upload configuration		
	$config['upload_path'] = './uploads/';
	$config['allowed_types'] = 'gif|jpg|png|jpeg';
	$config['max_size']	= '8192';
	$config['max_width']  = '0';
	$config['max_height']  = '0';
	
	//load the upload library
	$this->load->library('upload', $config);
	
	if(intval($_POST['attachments']) > 0){
		if(intval($_POST['attachments']) == 1){
			if ($this->upload->do_upload('attachment1')){
				echo 'subio';
			}else{
				echo $this->upload->display_errors();
			}	
		}else{
			$cont = 1;
			while($cont <= intval($_POST['attachments'])){
				//repeat the action for each file
				if ($this->upload->do_upload('attachment'.$cont)){
					echo 'subio';
				}else{
					echo $this->upload->display_errors();
				}
				
				//go to the next file
				$cont++;	
			}									
		}
	}
}
?>