What role does the include path play in PHP file inclusion and how can it be configured for better performance?

The include path in PHP is used to specify directories where PHP should look for included files. By configuring the include path properly, PHP can find and include files more efficiently, leading to better performance. This can be done by setting the include_path directive in the php.ini file or by using the set_include_path() function in your PHP code.

// Set the include path in php.ini
// include_path = ".:/usr/local/lib/php"

// Set the include path using set_include_path() function
set_include_path('.:/usr/local/lib/php');