PHP bind_result返回空結果

Question

我曾嘗試大多同類解決方案我在網上找到，但他們不似乎worrk這是我 PHP

$db_host = "localhost"; 
$db_name = "nm"; 
$db_user = "root"; 
$db_pass = ""; 
$mysqli_news = new mysqli($db_host, $db_user, $db_pass, $db_name); 

function topbanner() 
{ 
    global $mysqli_news; 
    $stmt = $mysqli_news->prepare("SELECT date FROM Ftemp_news_top_pic ORDER BY id DESC LIMIT 3"); 
    $stmt->execute(); 
    $stmt->bind_result($id, $image, $link, $source, $date); 
    while ($stmt->fetch()){ 
     return $date; 
    } 
    $stmt->close(); 


} 

echo topbanner();` 

和本我的分貝的PIC

Answer 1

錯誤來自$ stmt-> bind_result（）; 您的MySQL查詢從數據庫中選擇1列，並綁定5列，這是不可能的。這裏是應該正常工作：

$db_host = "localhost"; 
$db_name = "nm"; 
$db_user = "root"; 
$db_pass = ""; 
$mysqli_news = new mysqli($db_host, $db_user, $db_pass, $db_name); 

function topbanner() 
{ 
    global $mysqli_news; 
    $stmt = $mysqli_news->prepare("SELECT date FROM `Ftemp_news_top_pic` ORDER BY `id` DESC LIMIT 3"); 
    $stmt->execute(); 
    $stmt->bind_result($date); 
    while ($stmt->fetch()){ 
     echo $date; // echo/return $date column 
    } 
    $stmt->close(); 
} 

echo topbanner(); 

或爲topbanner（）如果你想獲得在數據庫中，使用的所有數據：

function topbanner() 
{ 
    global $mysqli_news; 
    $stmt = $mysqli_news->prepare("SELECT * FROM `Ftemp_news_top_pic` ORDER BY `id` DESC LIMIT 3"); 
    $stmt->execute(); 
    $stmt->bind_result($id, $title, $image, $link, $source, $date); 
    while ($stmt->fetch()){ 
     echo $date; //echo whatever column you want 
    } 
    $stmt->close(); 
} 

而且，知道，這取決於你如何想要使用函數，當你使用「return」的時候，你在while循環的第一次出現之後結束函數，如果你想獲得所有可用的值，你可以將結果附加到while循環的變量中，在函數結尾處返回變量，如下所示：

function topbanner() 
{ 
    global $mysqli_news; 
    $stmt = $mysqli_news->prepare("SELECT * FROM `Ftemp_news_top_pic` ORDER BY `id` DESC LIMIT 3"); 
    $stmt->execute(); 
    $stmt->bind_result($id, $title, $image, $link, $source, $date); 
    while ($stmt->fetch()){ 
     $result .= $date; //Append results to a variable 
    } 
    return $result; 
    $stmt->close(); 
} 

因此，與上面的代碼，你可以繼續呼應功能：

echo $topbanner();