How I can do replace correctly for Url? - php

Question

I have a code with switch language on site.
When url type is: site.com/ru/rumanya-test . My code replace a rumanya-test with mdmanya-test. How I can prevent this, without add slash on language?
My code:
if ($lang == 'ru') {
$ru_href = 'javascript:void(0);';
$en_href = str_replace("/ru", '/en', $_SERVER['REQUEST_URI']);
$md_href = str_replace("/ru", '/md', $_SERVER['REQUEST_URI']);
$logo_href = '/ru/';
} elseif ($lang == 'en') {
$ru_href = str_replace("/en", '/ru', $_SERVER['REQUEST_URI']);
$en_href = 'javascript:void(0);';
$md_href = str_replace("/en", '/md', $_SERVER['REQUEST_URI']);
$logo_href = '/en/';
} else {
$ru_href = str_replace("/md", '', $_SERVER['REQUEST_URI']);
$ru_href = '/ru' . $ru_href;
$en_href = str_replace("/md", '', $_SERVER['REQUEST_URI']);
$en_href = '/en' . $ru_href;
$md_href = 'javascript:void(0);';
$logo_href = '/';
}

Answer 1

You can use preg_replace with only first occurrence of match should be replaced.
$md_href = preg_replace('#/ru#', '/md', $_SERVER['REQUEST_URI'], 1);

Answer 2

If you are always going to keep the same url format (eg. domain/[language]/page) then there are a couple of options I can think of.
Option 1
Instead of replacing "/ru", replace "/ru/"
Option 2
Split the url by the "/" and replace the 2nd element with the required language.
$url = rtrim("site.com/ru/rumanya-test", '/') . '/'; // Adds a slash at the end of the url if it doesn't already exist
$parts = explode("/", $url);
// If the URL contains language information
if(count($parts > 1)) {
$newURL = $parts[0]."/en/".$parts[2];
}
// If it doesn't contain language information (ie. on the root domain)
else {
// Your logic here
}
Note: This assumes that the language will always be the second element of your url.