如何使用 PHP 在 mysql 中上传文件？ [复制]

Question

这是我的代码：

<?php
    include ('navbar.php');
?>
<form class = "container m-5" method = "POST" action = "upload.php" encytype = "multipart/form-data">
<input class = "form-control w-25" type = "file" name = "file">
<button class = "btn" type = "submit" name = "Upload">Upload</button>
</form>

<?php
include'connect.php';
$statusMsg = '';

// File upload path
$targetDir = "image";
$fileName = $_FILES["file"]["name"];
$targetFilePath = $targetDir . $fileName;
$fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);

if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])){
    // Allow certain file formats
    $allowTypes = array('jpg','png','jpeg','pdf');
    if(in_array($fileType, $allowTypes)){
        // Upload file to server
        if(move_uploaded_file($_FILES["file"]["tmp_name"], $targetFilePath)){
            // Insert image file name into database
            $insert = $db->query("INSERT into userid (FileName) VALUES ('".$fileName."'");
            if($insert){
                $statusMsg = "The file ".$fileName. " has been uploaded successfully.";
            }else{
                $statusMsg = "File upload failed, please try again.";
            } 
        }else{
            $statusMsg = "Sorry, there was an error uploading your file.";
        }
    }else{
        $statusMsg = 'Sorry, only JPG, JPEG, PNG, GIF, & PDF files are allowed to upload.';
    }
}else{
    $statusMsg = 'Please select a file to upload.'; 
}

// Display status message
echo $statusMsg;
?>

我收到的唯一消息是这个

注意：未定义索引：C:\xampp\htdocs\Project\upload.php 中的文件 第 15 行请选择要上传的文件。

我的数据库中什么也没有显示

Answer 1

首先检查文件是否设置：

if(isset($_FILES["file"])) {
    include'connect.php';
    $statusMsg = '';

    // File upload path
    $targetDir = "image";
    // ...
}

您似乎也在这里缺少/

$targetDir = "image/";   // <-- here
$targetFilePath = $targetDir . $fileName;

既然你这样做了

if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])) {

然后，您可以在if 语句中移动位于 HTML 下的 php 代码，在这种情况下，您无需检查文件 是否已设置，因为 empty() 也涵盖isset()：

if(isset($_POST["Upload"]) && !empty($_FILES["file"]["name"])) {
    include'connect.php';
    $statusMsg = '';

    // File upload path
    $targetDir = "image/";
    $fileName = $_FILES["file"]["name"];
    $targetFilePath = $targetDir . $fileName;
    $fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);

    // Allow certain file formats
    $allowTypes = array('jpg','png','jpeg','pdf');
    
    //...
}

注意：正如 @MagnusEriksson 在 cmets 中所指出的，您的按钮名称是 Upload，因此您应该在 isset() 函数中检查它。

Answer 2

试试这个代码。

您的代码中有 2 个错字。

1. 表单属性应该是enctype 而不是encytype。

2. 更改提交按钮名称，例如 Upload。

3. 将输入类型文件名更改为其他名称，例如filename

    <form class = "container m-5" method = "POST" action = "upload.php" enctype="multipart/form-data">
    <input class = "form-control w-25" type = "file" name = "filename">
    <button class = "btn" type = "submit" name = "Upload">Upload</button>
    </form>
   
    <?php
    include'connect.php';
    $statusMsg = '';
   
    // File upload path
   
    if(isset($_POST["Upload"]) && !empty($_FILES["filename"]["name"])){
        $targetDir = "image/";
        $fileName = $_FILES["filename"]["name"];
        $targetFilePath = $targetDir . $fileName;
        $fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);
        // Allow certain file formats
        $allowTypes = array('jpg','png','jpeg','pdf');
        if(in_array($fileType, $allowTypes)){
            // Upload file to server
            if(move_uploaded_file($_FILES["filename"]["tmp_name"], $targetFilePath)){
                // Insert image file name into database
                $insert = $db->query("INSERT into userid (FileName) VALUES ('".$fileName."'");
                if($insert){
                    $statusMsg = "The file ".$fileName. " has been uploaded successfully.";
                }else{
                    $statusMsg = "File upload failed, please try again.";
                } 
            }else{
                $statusMsg = "Sorry, there was an error uploading your file.";
            }
        }else{
            $statusMsg = 'Sorry, only JPG, JPEG, PNG, GIF, & PDF files are allowed to upload.';
        }
    }else{
        $statusMsg = 'Please select a file to upload.'; 
    }
   
    // Display status message
    echo $statusMsg;
    ?>