HTTP_ACCEPT_LANGUAGE en-US to en_US

[Brian_15]

Need help with modifying current code to work with en_US instead of en-US and so on.

<?php
	// Languages we support
	// $available_languages = array("en", "en-us"); # old
        $available_languages = array("en", "en_US"); # new
	$default_language = "en"; // a default language to fall back to in case there's no match
	function prefered_language($available_languages, $http_accept_language) {
		global $default_language;
		$available_languages = array_flip($available_languages);
		$langs = array();
		preg_match_all('~([\w-]+)(?:[^,\d]+([\d.]+))?~', $http_accept_language, $matches, PREG_SET_ORDER);
		foreach($matches as $match) {
			list($a, $b) = explode('-', $match[1]) + array('', '');
			$value = isset($match[2]) ? (float) $match[2] : 1.0;
			if(isset($available_languages[$match[1]])) {
				$langs[$match[1]] = $value;
				continue;
			}
			if(isset($available_languages[$a])) {
				$langs[$a] = $value - 0.1;
			}
		}
		if($langs) {
			arsort($langs);
			return key($langs); // We don't need the whole array of choices since we have a match
		} else {
			return $default_language;
		}
	}
	$lang = prefered_language($available_languages, $_SERVER["HTTP_ACCEPT_LANGUAGE"]);
	print "<h3>Site available in:</h3><pre>";
	print_r($available_languages);
	print "</pre>\n<h3>Browser supported languages:</h3><pre>";
	print_r(explode(',',  $_SERVER["HTTP_ACCEPT_LANGUAGE"]));
	print "</pre>\n<h3>site will display in: <em>".$lang."</em></h3>";
?>

Edited October 10, 2016 by Brian_15

[requinix]

I see two places in that code that deal with hyphens in strings. Try replacing them with underscores.