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| <?php
/* This class checks available languages of browser
* and handle choice of preferred language
*
* Version 2.0
* Author Marc Paris
* Language identifiers are according to ISO 639-1 standard
*/
namespace Languages;
class Languages
{
/*
string language selected language
*/
private $language;
/*
string allowedLanguages
(languages which are available on the website)
*/
private $allowedLanguages;
/*
__construct save language in cookie
if days is <0 cookie is deleted
if days = 0 previous cookie is hold
if days >0 cookie is overwrite
*/
public function __construct(int $days=0, $lang='')
{
if (empty($lang))
$lang = $this->setLanguage($this->getLanguages()[0][0]);
if (isset($_COOKIE['language']) && $days <0)
{
unset($_COOKIE['language']);
}
if (isset($_COOKIE['language']) && $days == 0)
{
if (strlen($_COOKIE['language']) == 2)
$this->setLanguage($_COOKIE['language']);
else
throw new \Exception(sprintf("Cookie language '%s' is unknown in %", $_COOKIE['language'], __METHOD__));
}
if ($days > 0)
{
setcookie('language', $lang, $days*24*3600);
$this->setLanguage($lang);
}
}
/*
getLanguages search all available browser languages
return userLanguages
*/
public static function getLanguages()
{
//check to see if browser languages are setted
if ( isset( $_SERVER["HTTP_ACCEPT_LANGUAGE"] ) )
{
$languages = strtolower( $_SERVER["HTTP_ACCEPT_LANGUAGE"] );
// need to remove spaces from strings to avoid error
$languages = str_replace( ' ', '', $languages );
$languages = explode( ",", $languages );
foreach ( $languages as $language )
{
// pull out the language, place languages into array of full and primary
// string structure:
$temp_array = [];
// slice out the part before ; on first step, the part before - on second, place into array
$temp_array[0] = substr( $language, 0, strcspn( $language, ';' ) );//full language
$temp_array[1] = substr( $language, 0, 2 );// cut out primary language
//place this array into main $userLanguages language array
$userLanguages[] = $temp_array;
}
unset($language);
}
// else if no language found
else
{
$userLanguages[0] = array( '','','','' ); //return blank array
}
return $userLanguages;
}
/*
setAllowedLanguages
parameter langs: languages to be allowed
*/
public function addAllowedLanguages(string|array $lang)
{
if (is_string($lang))
$lang = (array) $lang;
foreach($lang as $lng)
{
if (strlen($lng) != 2)
throw new \Exception(sprintf("Wrong parameter value in %s. Each item must be 2 characters long.",__METHOD__));
}
$this->allowedLanguages[] = $lang;
}
/*
getAllowedLanguages
return allowed languages
*/
public function getAllowedLanguages()
{
return $this->allowedLanguages;
}
/*
setLanguage set selected Language
parameter lang: language to be setted
*/
public function setLanguage(string $lang)
{
if (strlen($lang) != 2)
throw new \Exception(sprintf("Wrong parameter value in %s. Parameter must be 2 characters long.",__METHOD__));
$this->language = $lang;
if(!checkLanguage($lang))
return false;
return true;
}
/*
checkLanguage checks if selected Language is allowed
parameter lang: language to be checked
*/
public function checkLanguage(string $lang)
{
if(in_array($lang,$this->allowedLanguages))
return true;
return false;
}
/*
getLanguage
return selected language
*/
public function getLanguage()
{
return $this->language;
}
}
// make the class directly available on the global namespace
class_alias('Languages\Languages', 'Languages', false); |
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