How to allow a user to read and edit files in a test folder using PHP?

To change file ownership through PHP, you need to keep in mind that the chown command requires root privileges. If PHP is running under a user without root permissions, the command will not execute.

Here are a few possible solutions:
1. Run PHP under the user with the necessary permissions.
Configure PHP (e.g., through PHP-FPM) to run under a user who has access to the required files. You can do this by editing the PHP-FPM configuration and specifying the appropriate user and group.

2. Add the PHP user to the correct group.
You can add the user running PHP to the same group as the user creating the files (e.g., nginx). Configure the file permissions so that the files are accessible to the group, and use umask(0007) in PHP to create files with the appropriate permissions.

3. Grant full access to all users.
Using umask(0000) and setting file permissions to 0777 via chmod() is a simple, but insecure method. It allows any system user full access to the files. This approach is only recommended for test environments or cases where security is not a concern