phpweb上传图片无法显示

// 确保文件路径正确
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
    echo "The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded.";
} else {
    echo "Sorry, there was an error uploading your file.";
}

# 设置文件权限为644
chmod 644 /path/to/uploaded/file.jpg

// 允许上传的文件类型
$allowed_types = array('jpg', 'jpeg', 'png', 'gif');
$file_type = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
if (!in_array($file_type, $allowed_types)) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    exit;
}

# 修改php.ini文件
upload_max_filesize = 2M
post_max_size = 8M

<!-- 确保表单设置了正确的enctype属性 -->
<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload File" name="submit">
</form>