Mysqli編寫語句寄存器

Question

好的，我有一個問題。我需要檢查用戶是否已經存在，但問題是現在我需要在if()中輸入我無法獲取，因爲我已經關閉，但如果我沒有關閉，我得到一個錯誤，因爲無法運行2條語句。所以我想如果有人能幫助我？我有其他代碼，但我只在這裏給代碼。

這裏是我的代碼：

$result = $mysqli->prepare("SELECT username FROM user WHERE username=?"); 
$result->bind_param("s", $username); 
$result->execute(); 
$result->bind_result($username);         
$result->close(); 

if(){ 
$register = $mysqli->prepare("INSERT INTO user 
        (username, password, email, rr, rank) 
        VALUES (?, ?, ?, ?, ?)"); 
$register->bind_param("sssii", $username, $kode, $email, $rr, $rank); 
$register->execute(); 
$register->close();         
} else { 
    echo "User already exists!"; 
} 

Answer 1

更新： 「！用戶已經存在」 更符合邏輯的說法

$result = $mysqli->prepare("SELECT username FROM user WHERE username=?"); 
$result->bind_param("s", $username); 
$result->execute(); 
$found = $result->fetch();       
$result->close(); 

if ($found){   
    echo "User already exists!";           
} else { 
    $register = $mysqli->prepare("INSERT INTO user 
        (username, password, email, rr, rank) 
        VALUES (?, ?, ?, ?, ?)"); 
    $register->bind_param("sssii", $username, $kode, $email, $rr, $rank); 
    $register->execute(); 
    $register->close(); 

}