$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
foreach ($result as $temp){			
     $return_text .= $temp;
}					


array_push($result, "a", "b");


$update_data = array();
for ($i=0;$i<=count($session_update_db_field)-1;$i++) {
	$update_data[$session_update_db_field[$i]] = $this->input->post($session_update_form_field[$i]);
}