CodeIgniter method that extends Language.php for get the language by browser.

MY_Language.php

public function get_langname_byBrowser()
{
	$this->CI = & get_instance();
	
	// inicializamos, por si no detecta ninguna el navegador
	$name = "";
		
	//prepare user language array
	$languages = array();
	$languages[0] = '';
		
	//check to see if language is set
	if ( isset( $_SERVER["HTTP_ACCEPT_LANGUAGE"] ) ) 
	{
		//explode languages into array
		$languages = strtolower( $_SERVER["HTTP_ACCEPT_LANGUAGE"] );
		$languages = explode( ",", $languages );
	}

	$pos = strpos(strtolower($languages[0]),'es');
	if ( $pos !== false )
		$name = "spanish";
	else
		$name = "english";
		
	return $name;
}