What are the potential pitfalls of not setting the upload_tmp_dir in the php.ini file on a hosted web server?

Not setting the upload_tmp_dir in the php.ini file on a hosted web server can lead to potential security risks such as exposing sensitive files uploaded by users. It can also cause performance issues as temporary files may be stored in a default system directory which can quickly fill up. To solve this issue, you can set the upload_tmp_dir directive in the php.ini file to specify a secure directory for storing temporary files.

// Set the upload_tmp_dir in the php.ini file
upload_tmp_dir = "/path/to/secure/directory"