防止從「注意：數組字符串轉換在」

Question

我需要從預防幫助「注意：數組字符串轉換在」

$stmt = $DBH->prepare("SELECT * FROM users WHERE id = :emailid"); 
$stmt->bindParam(':emailid', $emailid, PDO::PARAM_STR); 
$stmt->execute(); 
$result = $stmt->fetchAll();  
foreach($result as $row) 
    { 
    echo $row['id'].'<br />'; 
    echo $row['emailid'].'<br />'; 
    echo $row['password']; 
    } 

Everythink其OK，index.php?id=5

但是當我把index.php?id[]=5

回到我錯誤

Notice: Array to string conversion in 

什麼是最好的w^ay在這種情況下檢查數組; error_reporting(0)不是我想找到優化方法的解決方案。

Answer 1

不知道你想要這個問題走向哪個方向。但是讓我們假設你想要的 - 出於某種原因 - 讓它工作兩種方式：?id=...和?id[]=...&id[]=...

if (!is_array($_GET['id'])) { 
    // just make it an array with one element 
    $ids = array($_GET['id']); 
    // so having a simple type string id is just a special case of the 
    // array case 
} 
else { 
    $ids = $_GET['id']; 
} 

$stmt = $DBH->prepare("SELECT * FROM users WHERE id = :emailid"); 
$stmt->bindParam(':emailid', $emailid, PDO::PARAM_STR); 
foreach($ids as $emailid) { 
    $stmt->execute(); 
    $result = $stmt->fetchAll();  
    foreach($result as $row) { 
     ... 
    } 
}