What are some common issues with file uploads on PHP websites?

One common issue with file uploads on PHP websites is the file size limit set by the server. To solve this issue, you can increase the `upload_max_filesize` and `post_max_size` directives in your php.ini file to allow larger file uploads.

// Increase file size limit in php.ini
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '25M');