A base controller for AJAX only

Although I'm not the captain of the REST train, this could possibly be more useful if it checked for all of the REST methods, and checked for input from php://input. A little snippet of my (non-CodeIgniter) class:

PHP Code:

/**
 * For put or patch requests, the input data will be in php://input,
 * unless this is a POST disguised as a PUT or PATCH.
 */
protected function _fetch_input_data()
{
    // If there's a post array, just return it
    if( in_array( $this->method, ['put','patch'] ) && ! empty( $_POST ) )
        return $_POST;

    // Otherwise, check PHP's input stream
    if( in_array( $this->method, ['put','patch'] ) )
    {
        $input = $this->_cache_php_input();

        if( ! empty( $input ) )
            return $this->_process_php_input();
    }

    return NULL;
}

// -----------------------------------------------------------------------

/**
 * Cache contents of php://input
 */
protected function _cache_php_input()
{
    ! is_null( $this->_php_input ) OR 
        $this->_php_input = file_get_contents('php://input');

    return $this->_php_input;
}

// -----------------------------------------------------------------------

/**
 * Parse, decode, unserialize, or otherwise process the php input.
 */
protected function _process_php_input()
{
    switch( $this->content_type )
    {
        case 'application/x-www-form-urlencoded':
            parse_str( $this->_php_input , $vars );
            break;
        case 'application/json':
            $vars = json_decode( $this->_php_input, TRUE);
            break;
        case 'application/vnd.php.serialized':
            $vars = unserialize( $this->_php_input );
            break;
        default:
            $vars = $this->_php_input;
    }
    
    return $vars;
}

// ----------------------------------------------------------------------- 


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