>>924089
since you're using PHP, take some care to
1. test for obvious file-upload vulnerabilities. Upload a PHP script and then try to visit it. You want to see source code, and not have the script actually run.
2. repeat #1 for a file that contains embedded PHP but which doesn't end in .php or similar extension.
3. see if you can change site behavior by uploading a file named .htaccess, or index.html
be advised: if people can upload arbitrary HTML and assets and then browse to them normally, you SHALL come to host a phishing site or other malware
4. make sure nothing important can be seen or touched by the account this file upload script is on, because it probably has some non-obvious vulnerabilities.
#1 and #2 you can probably fix just by editing an .htaccess