What role does the server configuration, specifically the "phar.readonly" setting, play in the behavior of PHP functions like exec()?

When the "phar.readonly" setting is enabled in the server configuration, it restricts the ability for PHP functions like exec() to execute Phar archives. To resolve this issue and allow PHP functions to execute Phar archives, the "phar.readonly" setting needs to be disabled in the php.ini configuration file.

// Disable phar.readonly setting in php.ini
ini_set('phar.readonly', 0);