防止从“注意：数组字符串转换在”

Question

我需要从预防帮助“注意：数组字符串转换在”

$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

但是当我把index.php?id[]=5

回到我错误

Notice: Array to string conversion in 

什么是最好的w^ay在这种情况下检查数组; error_reporting(0)不是我想找到优化方法的解决方案。

Answer 1

不知道你想要这个问题走向哪个方向。但是让我们假设你想要的 - 出于某种原因 - 让它工作两种方式：?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) { 
     ... 
    } 
}