Php 为while语句中的图像添加alt

有人能帮忙吗？ 这是我的代码。我想为图像添加一个alt选项，但我所做的一切都会抛出错误。 我曾尝试学习php手册，并尝试从其他问题中复制代码，但迄今为止没有成功

<?php
$servername = "localhost";
$username = "logosewe_5";
$password = "password";
$dbname = "logosewe_5";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "SELECT * FROM mk2";

$sql = "SELECT * FROM mk2 WHERE brand='2786'";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo '<img src='$row['ming']'>';
    }
} else {
    echo "0 results";
}

$conn->close();
?>

您遇到了一个问题：

echo '<img src="' . $row['ming'] . '">';

将输出如下内容

<img src="myimage.jpg" alt="image name">

---

问题在于您的echo语句中没有alt属性，第二个问题是您的连接有点不正确，引号放错了位置

while($row = $result->fetch_assoc()) {
echo '<img src=' . $row['ming'] .  'alt="Your alt message">';
}

while（$row=$result->fetch_assoc（））{
回声'；
}

像这样更改代码：

 <?php
    $servername = "localhost";
    $username = "logosewe_5";
    $password = "password";
    $dbname = "logosewe_5";

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
    } 

    $sql = "SELECT * FROM mk2"
    ;

    $sql = "SELECT * FROM mk2 WHERE brand='2786'";

    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
    echo '<img src="'.$row['ming'].'" alt="'.$altText.'">'; //change here
     }
    } else {
    echo "0 results";
    }
    $conn->close();
    ?>

它抛出了什么错误？

 <?php
    $servername = "localhost";
    $username = "logosewe_5";
    $password = "password";
    $dbname = "logosewe_5";

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
    } 

    $sql = "SELECT * FROM mk2"
    ;

    $sql = "SELECT * FROM mk2 WHERE brand='2786'";

    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
    echo '<img src="'.$row['ming'].'" alt="'.$altText.'">'; //change here
     }
    } else {
    echo "0 results";
    }
    $conn->close();
    ?>