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I have modified permissions, edited config files, and rewritten my code several times and no results whatsoever. I am at a dead end and I have no way around this that I have come up with or been able to find online though countless help forums. The error that I am having seems so simple but has become a major roadblock.
I have a php script that runs on submit after one has upload up to 4 files, for simplicity and testing’s sake I have focused on just managing to upload 1 file but nothing so far. I have apparently used scripts that return no error and are guaranteed to work but they did not which leads me to believe that the issue I am having has to be a permissions issue somewhere.
The platform I am running is windows server 2012, IIS 8.5, PHP 5.5, and everything else (JavaScript, html, etc..) up to date as well. Now I have tried changing the folder permissions because I was told this is the majority of the Cause, however this has not been my case. I have modified the php.ini file to allow file uploads but that did not work either. Is there a setting that I am missing somewhere deep in IIS or is something entirely different?
Thank you for your time and assistance.

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Quick, focused checklist that fills gaps in the thread (for ) and follows ’s hint about IIS limits.

First-priority checks — confirm PHP is actually accepting the POST and what error PHP reports. Create a tiny test page with phpinfo() to confirm which php.ini is loaded and the values for upload_max_filesize, post_max_size, upload_tmp_dir, max_file_uploads, max_input_time and max_execution_time. Then run a minimal uploader that prints var_dump($_FILES) so the PHP error code is visible (0 = OK, 1/2 = size limits, 6 = missing tmp dir, 7 = cannot write, etc.). (php.net)

Quick code to drop in and test:

<?php
// phpinfo.php
phpinfo();
<?php
// upload-debug.php (form -> POST multipart/form-data)
var_dump($_FILES);
foreach ($_FILES as $f) {
  echo $f['name'].' error='.$f['error'].PHP_EOL;
}
?>

Permissions and temp folder — the IIS worker runs under the application-pool identity (for example IIS AppPool\YourPoolName) unless configured otherwise. That identity must have Modify/write on both the final upload folder and on PHP’s upload_tmp_dir (or the system temp if none set). Grant rights with Explorer or ICACLS (example):
icacls "C:\inetpub\wwwroot\uploads" /grant "IIS AppPool\MyAppPoolName":(OI)(CI)M . Check the pool identity under Application Pools → Advanced Settings. (learn.microsoft.com)

IIS-specific limits — adjust request filtering and server runtime if uploads fail at the server before PHP gets them. maxAllowedContentLength (requestFiltering → requestLimits) defaults to 30000000 bytes (~28.6MB). uploadReadAheadSize (serverRuntime) defaults to 49152 bytes (49KB) and often blocks larger uploads on SSL; raise it for the site if needed. These can be changed in Request Filtering (IIS Manager), via appcmd, or in web.config / applicationHost.config. Example snippets are straightforward (set bytes) and require an IIS/app-pool restart. (learn.microsoft.com)

If the phpinfo/upload-dump look fine but uploads still fail, enable Failed Request Tracing or check IIS logs for 413.x / 404.13 substatus codes; that shows whether IIS dropped the request before PHP ran. Make one change at a time, re-test, and capture the phpinfo and the exact $_FILES dump + IIS substatus when asking for more help. (learn.microsoft.com)

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