input.php

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<?php
class Input 
{
        public static function is($method = NULL)
        {
                if($method){                    
                        return $method == $_SERVER['REQUEST_METHOD'];
                }
                return $_SERVER['REQUEST_METHOD'];
        }
        
        public static function isAjax()
        {
                return (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest');
        }
        
        public static function post($var)
        {
                return filter_has_var(INPUT_POST, $var) ? $_POST[$var] : NULL;
        }

        public static function get($var = NULL)
        {
                if($var){
                        $value = filter_has_var(INPUT_GET, $var) ? filter_input(INPUT_GET, $var, FILTER_SANITIZE_STRING) : NULL;
                } else {
                        $value = filter_input_array (INPUT_GET, FILTER_SANITIZE_STRING);
                }
                        
                return $value;
        }

        public static function request($var)
        {
                return isset($_REQUEST[$var]) ? $_REQUEST[$var] : NULL;
        }

        public static function hasPost($var) 
        {
                return filter_has_var(INPUT_POST, $var);
        }

        public static function hasGet($var)
        {
                return filter_has_var(INPUT_GET, $var);
        }

        public static function hasRequest($var) 
        {
                return isset($_REQUEST[$var]);
        }
        
        public static function delete($var = NULL) 
        {
                if($var){
                        unset($_POST[$var]);
                } else {
                        unset($_POST);
                }
        }
        
        public static function filter($var)
    {
                //TODO
    }
}