php - Upload .dat file to be stored in json - php

Question

I am trying to upload .dat file, I want to get the content inside the file and have it in json.
I have this code:
HTML:
<from action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="fileUpload">
<button type="submit" name"btnSubmit">Upload</button>
</form>
PHP:
If(isset($_POST["btnSubmit"])) {
$file = file_get_contents($_FILES["fileUpload"]["name"], true);
$r = json_encode($file);
}
The error I get is file_get_contents("fileName.dat"): failed to open stream
I am not trying to upload the file to my server or a folder, I am trying to get the data inside it and store it into json.

Answer 1

A file upload will save the file in the php's defined temporary directory. From there you can either move the file to a desired location, or get the content from it. In your case you can simply get the content by using "tmp_name" instead of "name".
Future more, you have to make sure you have the enctype set in your form.
<?php
// check if file is given
if(!empty($_FILES)) {
// get file from temporary upload dir
$file = file_get_contents($_FILES["fileUpload"]["tmp_name"], true);
$r = json_encode($file);
// show restult
var_dump($r);
}
?>
<!-- add multipart -->
<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="fileUpload">
<button type="submit" name"btnSubmit">Upload</button>
</form>