PHP file upload gives successful error code, but no image appears - php

Question

For the sake of clarity I'll break this up into easy to navigate and readable sections.
The Issue:
The $_FILES super-global doesn't appear to hold any information after I upload a file. Despite this, I get error code 0 (successful upload) which seems contradictory.
Background:
I've been working on a personal website for a while now, and am working on a post management system. It's been going great so far, but I'm stuck fast trying to upload an image using $_FILES.
I've done this kind of thing many times at school and my job, but there appears to be some sort of issue with my computer, or I'm having a massive stroke of idiocy.
To fix this issue I've already:
Enabled file uploads in php.ini-production for the version I am using (php 7.1.7)
Changed values such as upload_max_filesize and post_max_size to 100m
Inspected the error code PHP is returning, returns error code 0, or UPLOAD_ERR_OK
Checked my own code for any simple mistakes I'm making. I can't see any, but that's usually the case when you have an error.
I'll include a small test page I wrote, and is demonstrating the issue:
text.php:
<?php
if(isset($_POST['submit'])){
echo $_FILES['a']['error'];
if(isset($_FILE['a']['tmp_name'])){
echo "hello";
}
}
?>
<form action = "text.php" method = "POST" enctype="multipart/form-data">
<label for = "a"> Send Image </label>
<input type = "file" name = "a" id = "a">
<input type = "submit" name = "submit" value = "Submit">
</form>
when the form is submitted, I get error code 0 but the hello test statement does not trigger.

Answer 1

Global array is named $_FILES you are checking for isset($_FILE['a']['tmp_name']
And if you want to check for uploaded file try using
if (is_uploaded_file($_FILES['a']['tmp_name'])) {
//file is uploaded
}