PHP: move_uploaded_file doesn't work - php

Question

I just want to move a temporary file to a specified folder. Here is my code.
$uploads_dir = $_SERVER['DOCUMENT_ROOT'].'/upload';
$name = basename($_FILES["csv"]["name"]);
$tmp_name = $_FILES["csv"]["tmp_name"];
chmod("{$uploads_dir}/{$name}", 0755);
if (!move_uploaded_file($tmp_name, "{$uploads_dir}/{$name}")):
array_push($fileErrArr, "fail to move uploaded file");
endif;
This is the error message from the httpd log. It doesn't even mention the "permission" stuff.
[error] [client XXX] PHP Warning: move_uploaded_file(/var/www/html/upload/XXX.csv): failed to open stream: \xe8\xa8\xb1\xe5\x8f\xaf\xe3\x81\x8c\xe3\x81\x82\xe3\x82\x8a\xe3\x81\xbe\xe3\x81\x9b\xe3\x82\x93 in /var/www/html/XXX/action.php on line 115, referer: https://XXX/
[error] [client XXX] PHP Warning: move_uploaded_file(): Unable to move '/tmp/php40tPEO' to '/var/www/html/upload/XXX.csv' in /var/www/html/XXX/action.php on line 115, referer: https://XXX/
Any help is appreciated. Thanks!

Answer 1

I think you can use this <?php echo exec('whoami'); ?> to check your PHP script runner.
Then use ls -l to check the target direction who is the owner.
Make sure the runner and the owner is the same.
Eg: the php runner may be www-data and the target folder owner may be admin. Use:
chown www-data /var/www/xxx/upload
chmod 755 /var/www/xxx/upload
It may work.

Answer 2

Hello Everyone I did encountered this error lately, I am also a beginner and solved this problem in just 3 hours this is the thing that helps me. I use Linux AMI EC2 intance.
The problem might be all about the "Writeability"(sorry I am not really familiar with terms please bear with me) permission of the folder maybe it is only allowed for the root
First make a script on the live serve and include this code to know what is the name
of the client that will execute the move_uploaded_file command of php
<?php
echo exec('whoami');
?>
Then it results to give me "apache" as my client's user
After it look for the folder the destination check if it is writeable by the client's side
using
ls -lh /var/www/folder/
then you will see like
the root and www on it
change it to
chown -R apache:apache /folder destination
Always take note that the user is the result of whoami php script
Hope this helps