What are common issues with PHP configuration on Ubuntu 14.0.4 regarding the public_html directory?

Common issues with PHP configuration on Ubuntu 14.04 regarding the public_html directory include permissions errors and incorrect configuration settings. To solve these issues, ensure that the public_html directory has the correct permissions set and that the PHP configuration file (php.ini) is properly configured to allow PHP execution within the public_html directory.

<Directory /var/www/html/public_html>
    Options Indexes FollowSymLinks
    AllowOverride None
    Require all granted
    php_admin_flag engine on
</Directory>