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if(isset($_GET['u']) && !empty($_GET['u']))
{
      $user= $_GET["u"];
      $result = mysqli_query($connection, "SELECT * FROM `login` WHERE `id`='{$user}' LIMIT 1");
      if(mysqli_num_rows($result)==1)
        {
    $row = mysqli_fetch_array($result);
    $username = $row['username'];
    $id = $row['id'];
  }
  else
  {
   echo 'error 404.';
  }
  if(isset($_GET['u']) && !empty($_GET['u']))
   {
    $check = mysqli_query($connection, "SELECT * FROM friend WHERE me='$globalid' AND friend='$id' OR me='$id' AND friend='$globalid'");
    if(mysqli_num_rows($check)==1)
    {
      echo 'V dryzyah!';
    }
    else {
      $from_query = mysqli_query($connection, "SELECT * FROM req WHERE 'from'='$id' AND 'to'='$globalid'");
      $to_query   = mysqli_query($connection, "SELECT * FROM req WHERE 'from'='$globalid' AND 'to'='$id'");
      if(mysqli_num_rows($from_query) ==1)
      {
        echo 'Add or No';
      }
      elseif(mysqli_num_rows($to_query) ==1)
       {
        echo 'Otmena zayavki';
      }
      else {
        echo 'Send REQ';
      }
    }
 
  }
}

Main.java:1: error: class, interface, or enum expected
if(isset($_GET['u']) && !empty($_GET['u']))
^
Main.java:1: error: class, interface, or enum expected
if(isset($_GET['u']) && !empty($_GET['u']))
  ^
Main.java:1: error: class, interface, or enum expected
if(isset($_GET['u']) && !empty($_GET['u']))
   ^
Main.java:4: error: class, interface, or enum expected
      $result = mysqli_query($connection, "SELECT * FROM `login` WHERE `id`='{$user}' LIMIT 1");
      ^
Main.java:5: error: class, interface, or enum expected
      if(mysqli_num_rows($result)==1)
      ^
Main.java:8: error: class, interface, or enum expected
    $username = $row['username'];
    ^
Main.java:8: error: unclosed character literal
    $username = $row['username'];
                     ^
Main.java:8: error: unclosed character literal
    $username = $row['username'];
                              ^
Main.java:9: error: class, interface, or enum expected
    $id = $row['id'];
    ^
Main.java:9: error: unclosed character literal
    $id = $row['id'];
               ^
Main.java:9: error: unclosed character literal
    $id = $row['id'];
                  ^
Main.java:10: error: class, interface, or enum expected
  }
  ^
Main.java:13: error: unclosed character literal
   echo 'error 404.';
        ^
Main.java:13: error: unclosed character literal
   echo 'error 404.';
                   ^
Main.java:18: error: class, interface, or enum expected
    if(mysqli_num_rows($check)==1)
    ^
Main.java:20: error: unclosed character literal
      echo 'V dryzyah!';
           ^
Main.java:20: error: unclosed character literal
      echo 'V dryzyah!';
                      ^
Main.java:24: error: class, interface, or enum expected
      $to_query   = mysqli_query($connection, "SELECT * FROM req WHERE 'from'='$globalid' AND 'to'='$id'");
      ^
Main.java:25: error: class, interface, or enum expected
      if(mysqli_num_rows($from_query) ==1)
      ^
Main.java:27: error: unclosed character literal
        echo 'Add or No';
             ^
Main.java:27: error: unclosed character literal
        echo 'Add or No';
                       ^
Main.java:31: error: unclosed character literal
        echo 'Otmena zayavki';
             ^
Main.java:31: error: unclosed character literal
        echo 'Otmena zayavki';
                            ^
Main.java:34: error: unclosed character literal
        echo 'Send REQ';
             ^
Main.java:34: error: unclosed character literal
        echo 'Send REQ';
                      ^
25 errors

Standard output is empty