Why is recursion not working in php?

Question

PHP

Hello.
Guys, help, it seems to be an easy task, but I can not solve it myself.
There is a code that pulls pages through url

function getData($url,$post=''){
  $dir = dirname(__FILE__).'/cookie.txt';
  $ch=curl_init();   
  $proxy = lastIp();
  curl_setopt($ch, CURLOPT_URL, $url); 
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_TIMEOUT, 35);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 35); 
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);  //Переходим по редиректам
  curl_setopt ($ch , CURLOPT_RETURNTRANSFER , 1 );	
  curl_setopt($ch, CURLOPT_PROXY, $proxy);
  //curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
  curl_setopt($ch, CURLOPT_FAILONERROR, true);
  //curl_setopt($ch, CURLOPT_POST, true);
  //curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
  curl_setopt($ch, CURLOPT_REFERER, "https://www.google.ru/");
  curl_setopt($ch, CURLOPT_COOKIEJAR, $dir);  // Записываем cookies в файл, чтобы потом можно было их считать
  curl_setopt($ch, CURLOPT_COOKIEFILE, $dir); // Теперь читаем cookies с файла;
  curl_setopt($ch, CURLOPT_USERAGENT, get_random_user_agent()); 
  $res=curl_exec($ch);		
  curl_close($ch);

  if(strlen($res)>0){
    updateIp($proxy,'success');
    return $res;
  }else{
    updateIp($proxy,'error');
    logs('Bad proxy '.$proxy.' on url '.$url);
    unset($res);
    sleep(1);
    getData($url);
    logs('recursia not work');
    return false;
  }
  
}

I call it getData($url,$post='') and in theory it should be repeated until something is cut. But for some reason it is not overloaded, when I write getData($link) in the code, it continues to work and returns me an empty value.
Who has any ideas?

Answer 1

Because in the else condition branch, the recursive function call does not return anywhere.

Answer 2

One of the necessary requirements of recursion is the mandatory possibility of a non-recursive exit.
This means that the return from the function for some kind of check somewhere must go before the recursive call.
There is no such case in your code.