How to check file upload area?

Question

I can not verify the correctness of the file upload fields, here is my code:

<?php if (isset($_POST['submit'])) { if ($_POST['uploadFile']) { echo "File uploaded"; } else { echo "No file attempted to be uploaded"; } } ?> <form action="" method="post" enctype="multipart/form-data"> <input type="file" name="uploadFile" /> <input type="submit" name="submit" /> </form> 

What mistake am I making?

EDIT

I came up with my own solution, maybe not the best, but it works:

 if (isset($_POST['submit'])) { $fileUpload = $_FILES['uploadFile'] ['name']; if (strlen($fileUpload) > 0) { echo "File uploaded."; } else { echo "No File attempted to be uploaded."; } } 

Answer 1

The superglobal you are looking for is $ _FILES.

 var_dump($_FILES); //to see what happening with the uploaded files 

To make a POST request, you can use the following lines:

 if($_SERVER['REQUEST_METHOD'] == 'POST') { //A post request! } 

Answer 2

For verification, take a look at is_uploaded_file() and read Handling File is_uploaded_file() .

Answer 3

In this script we will add some restrictions on file upload. The user can only upload .gif or .jpeg files, and the file size should be less than 20 kb:

 <?php if ((($_FILES["file"]["type"] == "image/gif") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/pjpeg")) && ($_FILES["file"]["size"] < 20000)) { if ($_FILES["file"]["error"] > 0) { echo "Error: " . $_FILES["file"]["error"] . "<br />"; } else { echo "Upload: " . $_FILES["file"]["name"] . "<br />"; echo "Type: " . $_FILES["file"]["type"] . "<br />"; echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />"; echo "Stored in: " . $_FILES["file"]["tmp_name"]; } } else { echo "Invalid file"; } ?> 

Answer 4

In downloading files with PHP, I think $ _FILES [$ file] ['error'] is your best friend! it breaks it into 8 possible scenarios, 0 means that the file upload went fine, so something like below should do the trick

 if($_FILES[$file]['error']==0) // proceed else switch($_FILES[$file]['error']) // debugging