What are the most common PHP-specific causes for an HTTP 500 error on a cPanel server?

Common PHP-specific causes include syntax errors in PHP files, exceeding PHP memory limits (`memory_limit`) or execution time limits (`max_execution_time`), unhandled exceptions or fatal errors within the PHP code, incompatible PHP versions (e.g., trying to run code written for PHP 8 on a server configured for PHP 7), and conflicts or errors arising from third-party PHP libraries or plugins.