How to extract the desired value from the address bar from the url?

Question

PHP

Hello!
Please tell me what's wrong?
There is a code with an array of cities, the purpose of which is to get the desired value from the link, compare it with the values ​​in the array and, if it matches, replace it with another value:

// Примечание: изначально для определения ссылки в адресной строке использую REQUEST_URI
// $url = $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$url = 'https://mysite.ru/uzlovaya/products';

  $cities_list = [
    // 'moscow'=> ['IP'=>'Москва', 'RP'=>'Москве'],
    // 'novosibirsk'=>['IP'=>'Новосибирск', 'RP'=>'Новосибирске'],
    // 'arhangelsk'=> ['IP'=>'Архангельск', 'RP'=>'Архангельске'],
    // 'balahna'=> ['IP'=>'Балахна', 'RP'=>'Балахне'],
    // 'uzlovaya'=> ['IP'=>'Узловая', 'RP'=>'Узловой'],
    // 'rostov-na-donu'=> ['IP'=>'Ростов-на-Дону', 'RP'=>'Ростове-на-Дону'],
    'uzlovaya'=>'Узловой'
  ];
$text = $url;
echo ( str_replace(array_keys($cities_list ), array_values($cities_list ), $text) );

which, for a string $url = 'https://mysite.ru/uzlovaya/products';, replaces "uzlovaya" with "Nodal", only doing it this way: https://mysite.ru/Узловой/products
Here str_replace works well, but how do I remove everything else, so that in the end the replaced value "Nodal" remains and nothing around it?
And how to carry out the output through str_replace if this type of array is used?
'uzlovaya'=> ['IP'=>'Узловая', 'RP'=>'Узловой'],

Answer 1

Understood.
1. Determined the url in the address bar
2. Split the url into an array and removed from the values ​​- "/"
3. Determined the number of the key that corresponds to the value of the city - $city_name[2];
( [2] - means that the value I need is the second in a row)
4. Using str_replace from the $custom_cities array, I replaced the received value with the required one and displayed it on the page.

$url = $_SERVER['REQUEST_URI'];
$city_name = explode("/", $url);
$custom_cities = [
 // массив городов может быть и 100 и 200 городов и более
'domodedovo' => 'Домодедово',
'uzlovaya' => 'Узловой',
'rostov-na-donu' => 'Ростове-на-Дону'
];
 $text = $city_name[2];
echo ( str_replace(array_keys($custom_cities), array_values($custom_cities), $text) );
}

Answer 2

lmgtfy.com/?q=php+routing
Specific examples:
Symfony Routing (see "placeholders")
PhpLeague Route (see "Wildcard Routes")
Aura.Router
In your case, a route like this should be defined:
/{city_name}/products(this is an example of Symfony Routing , in others, the meaning will not be radically different)
Further, if a request hits this route, you pass data to the desired controller - in this case, the value of the parameter city_name, and the logic associated with processing different cities is already working there.