SQL Server: Database stuck in "Rebuild" state with PHP

I tried to create a backup of my database according to the SQL Server instruction : Database is stuck in a "Restore" state . but my database is stuck in "Restore" state. php below:

$database = "container";
$uid = "sa";
$pwd = "12345" ; 

try {
      $conn = new PDO( "sqlsrv:Server=localhost\SQLEXPRESS;Database=$database", 
          $uid, 
          $pwd
          //,array(PDO::ATTR_PERSISTENT => true)
          ); 
  $conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); }
catch( PDOException $e ) {
  die( "Error connecting to SQL Server" ); }

echo "Connected to SQL Server\n";

$backfile = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Backup\sql server bk' ;
echo "Connected to SQL Server\n";
$backfile = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Backup\sql server bk'  ;

$query = "RESTORE DATABASE child_database FROM DISK = '$backfile' WITH  REPLACE, RECOVERY ";
$conn->exec($query);

      

        
        
        
      

    

After running this code, I got my child_date stuck in a recovery state. However, I copy the sql command

RESTORE DATABASE child_database FROM DISK = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Backup\sql server bk' WITH  REPLACE, RECOVERY

      

        
        
        
      

    

and run in Microsoft SQL Server Management Tool, it works fine.

I am trying to run add php code

$conn->exec("RESTORE DATABASE child_database WITH RECOVERY");

      

        
        
        
      

    

I have an exception.

Please, help.