我如何使用mysqli_fetch_assoc修復「致命錯誤：不能使用mysqli_result類型的對象作爲數組」

Question

我試圖運行mysql刪除事務時遇到致命錯誤，所以我搜索了類似的問題，它變得明顯使用mysqli_fetch_assoc是解決這個問題的方法。試了幾次，但顯然做錯了什麼，感謝任何幫助。

這裏是我的代碼

<?php 
$selected_admin = find_admin_by_id($_GET["admin"]); 
if (!$selected_admin) { 
    redirect_to("sadmin.php"); 
} 

while ($admin = mysqli_fetch_assoc($selected_admin)) { 
    $admin_id = $selected_admin["admin_id"]; 
} 

$sql = "delete from admin where admin_id = {$admin_id} limit 1"; 
$result = mysqli_query($connection, $sql); 

if ($result && mysqli_affected_rows($connection) == 1) { 
    $SESSION["message"] = "Admin successfully deleted."; 
    redirect_to("sadmin.php"); 
} else { 
    $SESSION["message"] = "Admin was not deleted successfully."; 
    redirect_to("sadmin.php?admin={$admin_id}"); 
} 
?> 

，功能正在呼叫的是這個

function find_admin_by_id($admin_id) { 
    global $connection; 

    $query = "select * from admin where admin_id = {$admin_id} LIMIT 1"; 
    $current_admin = mysqli_query($connection, $query); 
    confirm_query($current_admin); 
    return $current_admin; 
} 

Answer 1

您正在使用錯誤的變量在while循環和我的其他隊友也提到一小時前，這裏是正確的代碼略有變化：

<?php 
$selected_admin = find_admin_by_id($_GET["admin"]); 
if (!$selected_admin) { redirect_to("sadmin.php"); 
} 
while ($admin = mysqli_fetch_assoc($selected_admin)) 
{ 
$admin_id = $admin["admin_id"]; 
} 

if(intval($admin_id) > 0){ 
$sql = "delete from admin where admin_id = {$admin_id} limit 1"; 

$result = mysqli_query($connection, $sql); 

if ($result && mysqli_affected_rows($connection) == 1) 
{ 
$SESSION["message"] = "Admin successfully deleted."; 

redirect_to("sadmin.php"); 
} 
else { 
$SESSION["message"] = "Admin was not deleted successfully."; redirect_to("sadmin.php?admin={$admin_id}"); 
} 
} 
?> 

我改變了什麼：

將$ selected_admin更改爲$ admin。 並在執行DELETE STATEMENT之前添加條件。