致命的なエラー：booleanのメンバー関数close（）を呼び出す

Question

こんにちは、私は同じ種類の問題を抱えていますが、なぜうまくいかないのか混乱しています。

Fatal error: Call to a member function close() on boolean in includes\register_check.php on line 45 

$ stmt3-> close（）です。

コード

 } else { 
    if (strlen($_POST['username2']) < 2 || strlen($_POST['username2']) > 20) { 
     echo "<h3>Username must be between 2 and 20 characters!</h3>"; 
    } else { 
     $stmt = yasDB_select("SELECT `id` FROM `user` WHERE `username` LIKE '$username'"); 
     $stmt2 = yasDB_select("SELECT `id` FROM `user` WHERE `email` LIKE '$email'"); 
     if ($stmt->num_rows == 0 && $stmt2->num_rows == 0) { 
      $stmt3 = yasDB_insert("INSERT INTO `user` (`username`, `password`, `repeatpassword`, `name`, `email`, `website`, `plays`, `points`, `date`) VALUES ('$username','$password','$repeatpassword','$name','$email','$website','$plays','$points', '$date')", false); 
      if ($stmt3) { 
       echo "<h3>Registered! You may now log in.</h3>"; 
      } else { 
       $stmt3->close(); 
       echo "<h3>Registration failed!</h3>"; 
      } 
     } else { 
      $stmt->close(); 
      echo "<h3>Sorry, username or email exists. Please try again.</h3>"; 
     } 
    } 
} 

Answer 1

 $stmt3 = yasDB_insert("INSERT INTO `user` (`username`, `password`, `repeatpassword`, `name`, `email`, `website`, `plays`, `points`, `date`) VALUES ('$username','$password','$repeatpassword','$name','$email','$website','$plays','$points', '$date')", false); 
     if ($stmt3) { 
      echo "<h3>Registered! You may now log in.</h3>"; 
     } else { 
      $stmt3->close(); 
      echo "<h3>Registration failed!</h3>"; 
     } 

はおそらく$stmt3はあなたがしようとしたときCall to a member function close() on booleanエラーの原因となっているものであるfalsey（ほとんどの場合はfalse）、である、他のように

 $stmt3 = yasDB_insert("INSERT INTO `user` (`username`, `password`, `repeatpassword`, `name`, `email`, `website`, `plays`, `points`, `date`) VALUES ('$username','$password','$repeatpassword','$name','$email','$website','$plays','$points', '$date')", false); 
     if ($stmt3) { 
      $stmt3->close(); 
      echo "<h3>Registered! You may now log in.</h3>"; 
     } else { 
      // $stmt3 is falsey (null or false) here, so we cant call close on it. 
      echo "<h3>Registration failed!</h3>"; 
     } 

であるべきそれを近づけて呼び出す。