编辑博客文章时无法更改精选图像

Question

我正在创建一个PHP和SQL博客。在其他文件中，我有upload_file.php和edit_post.php。每次我编辑帖子时，它都会更新除特色图片以外的所有信息。它不会上传新的精选图片。这里是upload_file.php：

<?php 

if ($_SERVER['REQUEST_METHOD'] == 'POST'){ 

if (!empty($_FILES['post_image']['name'])) { 

$target_dir = "uploads/"; 
$target_file = $target_dir . basename($_FILES["post_image"]["name"]); 

$image_name = basename($_FILES["post_image"]["name"]); 

$uploadOk = 1; 
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION); 
// Check if image file is a actual image or fake image 
if(isset($_POST["submit"])) { 
    $check = getimagesize($_FILES["post_image"]["tmp_name"]); 
    if($check !== false) { 
     $file_image = "File is an image - " . $check["mime"] . "."; 
     $uploadOk = 1; 
    } else { 
     $file_not_image = "File is not an image."; 
     $uploadOk = 0; 
    } 
} 
// Check if file already exists 
if (file_exists($target_file)) { 
    $file_exists = "Sorry, file already exists."; 
    $uploadOk = 0; 
} 
// Check file size 
if ($_FILES["post_image"]["size"] > 5000000) { 
    $file_too_large = "Sorry, your file is too large."; 
    $uploadOk = 0; 
} 
// Allow certain file formats 
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" 
&& $imageFileType != "gif") { 
    $file_not_allowed = "Sorry, only JPG, JPEG, PNG & GIF files are allowed."; 
    $uploadOk = 0; 
} 
// Check if $uploadOk is set to 0 by an error 
if ($uploadOk == 0) { 
    $file_not_uploaded = "Sorry, your file was not uploaded."; 
// if everything is ok, try to upload file 
} else { 
    if (move_uploaded_file($_FILES["post_image"]["tmp_name"], $target_file)) { 
     $file_uploaded = "The file ". basename($_FILES["post_image"]["name"]). " has been uploaded."; 
    } else { 
     $file_error = "Sorry, there was an error uploading your file."; 
    } 
} 

} 

} 

?> 

这里是edit_post.php，减去形式：

<?php include("session_start.php")?> 

<?php include("upload_file.php")?> 

<?php include("links.php"); ?> 

<?php include("navigation.php"); ?> 

<?php 

if($_GET['id'] != ""){ 

$post_id = $_GET['id']; 

$sql = "SELECT * FROM posts WHERE post_id='$post_id' AND user_name='$user_name'"; 

$post = mysqli_query($connection, $sql) or die(mysqli_error($connection)); 

} 

?> 

<?php 

$sql = "SELECT DISTINCT post_category FROM posts WHERE user_name='$user_name'"; 

$cat = mysqli_query($connection, $sql) or die(mysqli_error($connection)); 

?> 

<?php 

if ($_SERVER['REQUEST_METHOD'] == 'POST'){ 

$post_title = isset($_POST['post_title']) ? $_POST['post_title'] : null; 
$post_content = isset($_POST['post_content']) ? $_POST['post_content'] : null; 
if($_POST['new_category']==""){ 
$post_category = ($_POST['choose_category']); 
}else{ 
$post_category = ($_POST['new_category']); 
} 
$post_date = isset($_POST['post_date']) ? $_POST['post_date'] : null; 

if (isset($image_name)){ 
$sql = "UPDATE posts SET post_title='$post_title', post_content='$post_content', post_category='$post_category', post_date='$post_date', post_image='$image_name' WHERE post_id='$post_id' AND user_name='$user_name'"; 
}else{ 
$sql = "UPDATE posts SET post_title='$post_title', post_content='$post_content', post_category='$post_category', post_date='$post_date' WHERE post_id='$post_id' AND user_name='$user_name'"; 
} 

$result = mysqli_query($connection, $sql) or die(mysqli_error($connection)); 

header('Location: index.php'); 

} 

?> 

<?php include "footer.php";?> 

我怎样才能解决这个问题？

Answer 1

我刚刚意识到这是不工作的原因是因为我忘记把enctype =“multipart/form-data”放在我的表单上！