codex – What’s the purpose to make use of operate strings for callbacks

All through the WordPress documentation I see callbacks being inserted as strings as an alternative of operate variables or closures. Let me examplify that;

operate wpdocs_my_save_posts( $post_ID, $put up, $replace ) {
   // do stuff right here
}
add_action( 'save_post', 'wpdocs_my_save_post', 10, 3 );

there is a little bit of a catch right here. This would possibly not work and no editor (vscode) would have the ability to discover out why. Whereas this might red-line:

$wpdocs_my_save_posts = operate( $post_ID, $put up, $replace ) {
   // do stuff right here
};
add_action( 'save_post', $wpdocs_my_save_post, 10, 3 );

as $wpdocs_my_save_post shouldn’t be outlined.

What’s the purpose to make use of a string as an alternative of a operate variable on this case?

Not opinionated I simply attempt to perceive.