The script does not parse by api, how to fix it?

Question

In contact with

api.php

<?php

 if($_POST["uid"] == "") {
echo '<div class="alert alert-warning"><center><h4>Заполните форму!</h4></center></div>';
}else{

      if (isset($_POST['uid'])){

      $uid = htmlspecialchars($_POST['uid']);


  $groups_getMembers = api("groups.getMembers", "group_id=" . $uid);
  $count = $groups_getMembers ["response"] ["count"];

  $groups_getById = api("groups.getById", "group_id=" . $uid . "&fields=photo_50,status,verified");
  $name = $groups_getById ["response"] ["0"] ["name"];
  $screen_name = $groups_getById ["response"] ["0"] ["screen_name"];
  $photo_50 = $groups_getById ["response"] ["0"] ["photo_50"];
  $status = $groups_getById ["response"] ["0"] ["status"];
  $type = $groups_getById ["response"] ["0"] ["type"];
  $verified = $groups_getById ["response"] ["0"] ["verified"];

         $cs = preg_replace("!http://(.*?)/(.*)!si", "http://\\1", $photo_50);
         $vk_com = preg_replace("!http://(.*?)/(.*?)!si", "\\1/\\2", $photo_50);
         $pp = preg_replace("!http://(.*?).vk.me/(.*?)!si", "\\1/\\2", $photo_50);


           if($cs == "http://vk.com") {

           $img = "https://".$vk_com."";
       
            } else {

           $img = "https://pp.vk.me/".str_replace(array("cs"), array("c"), $pp)."";

            }






        if($verified == "1"){
        $ver = "Присутствует";
        }
        else{
        $ver = "Отсутствует";
        }


        if($count){

  echo '<div class="alert alert-info">
             <img style="float:right;" src="'.$img.'">
             '.$name.'<br><br>
             Верификация: '.$ver.'<br>
             Тип группы: '.$type.'<br>
             Статус: '.$status.'<br>
             Домен: vk.com/'.$screen_name.'</div>';

  }else{

  echo '<div class="alert alert-warning"><center><h4>Ошибка</h4></center></div>';
        }
          }
            }
                           function api($method, $parameter) { 
                 $return = curl("https://api.vk.com/method/" . $method . "?" . $parameter);
                 return json_decode($return, true); 
                             }
          	function curl($url, $post = null) {
    $ch = curl_init( $url );
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.3) Gecko/2008092417
    Firefox/3.0.3');
    if	($post) {
      curl_setopt($ch, CURLOPT_POST, 1);
      curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    }
    curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, false );
    curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
    $response = curl_exec( $ch );
    curl_close( $ch );
    return $response;
    }
           ?>

index.php

<?php

 if($_POST["uid"] == "") {
echo '<div class="alert alert-warning"><center><h4>Заполните форму!</h4></center></div>';
}else{

      if (isset($_POST['uid'])){

      $uid = htmlspecialchars($_POST['uid']);


  $groups_getMembers = api("groups.getMembers", "group_id=" . $uid);
  $count = $groups_getMembers ["response"] ["count"];

  $groups_getById = api("groups.getById", "group_id=" . $uid . "&fields=photo_50,status,verified");
  $name = $groups_getById ["response"] ["0"] ["name"];
  $screen_name = $groups_getById ["response"] ["0"] ["screen_name"];
  $photo_50 = $groups_getById ["response"] ["0"] ["photo_50"];
  $status = $groups_getById ["response"] ["0"] ["status"];
  $type = $groups_getById ["response"] ["0"] ["type"];
  $verified = $groups_getById ["response"] ["0"] ["verified"];

         $cs = preg_replace("!http://(.*?)/(.*)!si", "http://\\1", $photo_50);
         $vk_com = preg_replace("!http://(.*?)/(.*?)!si", "\\1/\\2", $photo_50);
         $pp = preg_replace("!http://(.*?).vk.me/(.*?)!si", "\\1/\\2", $photo_50);


           if($cs == "http://vk.com") {

           $img = "https://".$vk_com."";
       
            } else {

           $img = "https://pp.vk.me/".str_replace(array("cs"), array("c"), $pp)."";

            }






        if($verified == "1"){
        $ver = "Присутствует";
        }
        else{
        $ver = "Отсутствует";
        }


        if($count){

  echo '<div class="alert alert-info">
             <img style="float:right;" src="'.$img.'">
             '.$name.'<br><br>
             Верификация: '.$ver.'<br>
             Тип группы: '.$type.'<br>
             Статус: '.$status.'<br>
             Домен: vk.com/'.$screen_name.'</div>';

  }else{

  echo '<div class="alert alert-warning"><center><h4>Ошибка</h4></center></div>';
        }
          }
            }
                           function api($method, $parameter) { 
                 $return = curl("https://api.vk.com/method/" . $method . "?" . $parameter);
                 return json_decode($return, true); 
                             }
          	function curl($url, $post = null) {
    $ch = curl_init( $url );
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.3) Gecko/2008092417
    Firefox/3.0.3');
    if	($post) {
      curl_setopt($ch, CURLOPT_POST, 1);
      curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    }
    curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, false );
    curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
    $response = curl_exec( $ch );
    curl_close( $ch );
    return $response;
    }
           ?>

The bottom line is, you insert a link to the VK group, and it checks the information of the group, but when I click on the button, nothing happens