如何在Php中上传Pdf

Question

我成功上传了一个PDF文件，但我无法上传到特定的命名上传内容：

在点击上传按钮之前，我收到通知：

Notice: Undefined index: myFile in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo3.php on line 8

Notice: Undefined variable: error in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo3.php on line 9

Notice: Undefined index: myFile in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo3.php on line 11

Notice: Undefined index: myFile in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo3.php on line 13

Notice: Undefined variable: uploads_dir in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo3.php on line 15

Notice: Undefined variable: uploads_dir in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo3.php on line 15


           /*After Clicking on Upload Button*/

1.)Notice:Use of undefined constant UPLOAD_DIR - assumed 'UPLOAD_DIR' in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo.php on line 20                                                                           
2.)Notice: Use of undefined constant UPLOAD_DIR - assumed 'UPLOAD_DIR' in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo.php on line 27
3.)Notice: Use of undefined constant UPLOAD_DIR - assumed 'UPLOAD_DIR' in C:\xampp\htdocs\PDF UPLOAD DEMO\Upload_PDF_Demo.php on line 34                                                                           

这是我的代码

<?php

         define("uploads","./");

        //$uploads_dir = $_SERVER['DOCUMENT_ROOT'].'/uploads/';
         $_FILES["myFile"]["error"];
        if ($error == UPLOAD_ERR_OK) 
        {
        $tmp_name = $_FILES["myFile"]["tmp_name"];
        echo "".$tmp_name;
        $name = $_FILES["myFile"]["name"];
        echo "".$name;
        move_uploaded_file($tmp_name, $uploads_dir."/".$name, $uploads_dir);
        echo "".$tmp_name;
        }
         echo $_SERVER['DOCUMENT_ROOT'];
?>
        <form action="Upload_PDF_Demo.php" method="post"   enctype="multipart/form-data"> 
        <input type="file" name="myFile">
        <br>
        <input type="submit" value="Upload">
        </form>

点击上传按钮前的注意事项

点击上传按钮后的通知

我的计划的输出

Answer 1

你必须在

之前检查请求中是否有文件

if (!empty($_FILES['myFile']['name'])) {
     define("uploads","./");

        //$uploads_dir = $_SERVER['DOCUMENT_ROOT'].'/uploads/';
         $_FILES["myFile"]["error"];
        if ($error == UPLOAD_ERR_OK) 
        {
        $tmp_name = $_FILES["myFile"]["tmp_name"];
        echo "".$tmp_name;
        $name = $_FILES["myFile"]["name"];
        echo "".$name;
        move_uploaded_file($tmp_name, $uploads_dir."/".$name, $uploads_dir);
        echo "".$tmp_name;
        }
         echo $_SERVER['DOCUMENT_ROOT'];
}


<form action="Upload_PDF_Demo.php" method="post"   enctype="multipart/form-data"> 
    <input type="file" name="myFile">
    <br>
    <input type="submit" value="Upload">
</form>