Question

It may be a silly question, but I cant understand how I can access every function (from functions.php for example) in WordPress without any include or require calls, I know if I want to create a new script I can simply require wp-load.php from that particular script, just dont understand why this is isn’t needed in other template files.

Answer 1

WordPress does that automatically. Whenever there is a functions.php file for the active theme, WP will load it for you. The magic happens in wp-settings.php, specifically among the following lines:

if ( ! defined( 'WP_INSTALLING' ) || 'wp-activate.php' === $pagenow ) {
    if ( TEMPLATEPATH !== STYLESHEETPATH && file_exists( STYLESHEETPATH . '/functions.php' ) )
        include( STYLESHEETPATH . '/functions.php' );
    if ( file_exists( TEMPLATEPATH . '/functions.php' ) )
        include( TEMPLATEPATH . '/functions.php' );
}