How can file permissions impact the functionality of PHP scripts, such as sending emails?

File permissions can impact the functionality of PHP scripts by restricting access to necessary files, such as those used for sending emails. To solve this issue, ensure that the PHP script has the necessary read and write permissions to access the files required for sending emails. This can be done by setting the appropriate file permissions using chmod in the server environment.

// Set appropriate file permissions for sending emails
chmod("email_template.txt", 0644);
chmod("email_log.txt", 0666);