What are common reasons for PHP not having write permissions in a test environment on a PC?

Common reasons for PHP not having write permissions in a test environment on a PC include incorrect file permissions set on the directory where PHP is trying to write files, the directory being owned by a different user, or PHP running in a restricted environment. To solve this issue, you can try changing the file permissions on the directory where PHP needs to write files using the `chmod` command in your terminal. You can also try changing the owner of the directory to the user running the PHP process.

// Change file permissions on the directory
chmod('/path/to/directory', 0777);

// Change owner of the directory
chown('/path/to/directory', 'username');