PHP uploading 0 bytes image - php

Question

When I upload an imagen with PHP, I get no errors and the image is 0 bytes on server.
Things considered:
File_uploads is On in phpinfo()
Upload_max_filesize is 8M in phpinfo()
Upload_tmp_dir is set and has 777 permisions
If I run file_exists($_FILES['userfile']['tmp_name']), it returns
true
If i run getimagesize($_FILES['userfile']['tmp_name']), I get an Read
Error notice. The image is valid and can be opened with system image
viewer
I am using a very simple upload script for testing:
HTML:
<form enctype="multipart/form-data" action="upload.php" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="512000" />
Send this file: <input name="userfile" type="file" />
<input type="submit" value="Send File" />
</form>
PHP:
<?php
//$uploaddir = '/var/www/html/upload';
$uploaddir = '';
$uploadfile = $uploaddir . basename($_FILES['userfile']['name']);
echo "<p>";
if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {
echo "File is valid, and was successfully uploaded.\n";
} else {
echo "Upload failed";
}
echo "</p>";
echo '<pre>';
echo 'Here is some more debugging info:';
print_r($_FILES);
print "</pre>";
?>
When I submit the file, I get no errors and the image is created in the destination folder, with the correct name and extension, but as the title says, it is 0 bytes (of course, it can't be oppened).
Thanks for your time.
EDIT
Sajad Karuthedath just made me see that $_FILE['file']['size'] value is 0 !! What can be the problem causing files are not being uploaded correctly?
EDIT 2
Uploading txt, pdf, tar files is working properly.. The problem is only with image type files!

Answer 1

try this simple upload script ,
you should check for errors before saving to server
if ( 0 < $_FILES['file']['error'] ) {
echo 'Error: ' . $_FILES['file']['error'] . '<br>';
}
else {
move_uploaded_file($_FILES['file']['tmp_name'], 'uploads/'.$_FILES['file']['name']);
}
Note: don't forget to restart your server or xampp after changing phpinfo()
Note: also change post_max_size = 25M in php

Answer 2

In order to track the issue just add an "exit;" straight after the "move_uploaded_file..." command and if the file is properly uploaded it's the code after the "move_upload" which is wrong.
In my case I was opening the uploaded file after upload with an overwrite (w+) option in order to check the lock state of the file. which was making a empty file.