Are there specific differences in starting and stopping the Apache server on UNIX compared to Linux systems that should be considered when troubleshooting PHP display issues?

When troubleshooting PHP display issues on Apache servers running on UNIX or Linux systems, it is important to check the server configuration files, such as httpd.conf or php.ini, for any misconfigurations that may be affecting PHP script execution. Additionally, restarting the Apache server may help apply any changes made to the configuration files.

// Sample PHP code to restart Apache server on UNIX/Linux systems
exec('sudo systemctl restart apache2');