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<?php class UriLanguageResolver { private $languages; private $defaultLanguage; private $uriBase; private $regex; public function __construct(array $languages, string $defaultLanguage, string $uriBase = '') { if (!\in_array($defaultLanguage, $languages)) { throw new \InvalidArgumentException('Default language not present in supported languages'); } $this->languages = $languages; $this->defaultLanguage = $defaultLanguage; $this->uriBase = $uriBase; $this->regex = '(^(' . \preg_quote($this->uriBase) . ')/(' . \implode('|', $languages) . ')(?=/|$)(.*))'; } public function resolve(string $uri): UriWithLanguage { $language = $this->defaultLanguage; if (\preg_match($this->regex, $uri, $match)) { $language = $match[2]; $uri = $match[1] . $match[3]; } return new UriWithLanguage($language, $uri); } } class UriWithLanguage { public $language; public $uri; public function __construct($language, $uri) { $this->language = $language; $this->uri = $uri; } } $resolver = new UriLanguageResolver(['en', 'fr', 'de', 'nl'], 'en', '/cms'); $tests = [ '/cms/articles/foo', '/cms/en/articles/foo', '/cms/fr/articles/foo', ]; foreach ($tests as $test) { $parts = $resolver->resolve($test); echo " Input URI: {$test} Route URL: {$parts->language}{$parts->uri} "; } echo 'cms/en/articles/foo'; //My Need