An alternative to your way would be to access the $post
global:
global $post
echo $post->ID;
But
- It won’t make a noticeable difference, either way
- If you want to increase efficiency, you ought to be looking elsewhere…
EDIT, pertaining to comments:
what about
get_the_ID();
?
–> Needs to be run inside the Loop.
i have tried both options (get_the_ID and accessing $post global) both give me a wrong id.
If the latter is the case, you, or some plugin you are using, has not properly reset postdata.
You say to look elsewhere… where should I be looking?
I have no idea what it is you are writing. But if you experience resource bottlenecks or inefficiency, retrieval of the current post ID is likely not the cause.