PHP bind_result返回空结果

Question

我曾尝试大多同类解决方案我在网上找到，但他们不似乎worrk这是我 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();` 

和本我的分贝的PIC

Answer 1

错误来自$ stmt-> bind_result（）; 您的MySQL查询从数据库中选择1列，并绑定5列，这是不可能的。这里是应该正常工作：

$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(); 

或为topbanner（）如果你想获得在数据库中，使用的所有数据：

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，这取决于你如何想要使用函数，当你使用“return”的时候，你在while循环的第一次出现之后结束函数，如果你想获得所有可用的值，你可以将结果附加到while循环的变量中，在函数结尾处返回变量，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，与上面的代码，你可以继续呼应功能：

echo $topbanner();