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Recently was working on a custom WordPress theme where I wanted to add the feature image outside of the main loop. All that was needed to be done was to tell WordPress to get the feature image ID associated with the page and retrieve it form the database.
Originally I used
Though something wasn’t quiet right. By using $post->ID it meant that I would be modifying the default loop ($post global) within WordPress which has implications. On the surface it all looked good and worked well but was it the best practice?
In the past I had been reading about issues associated with when you query posts. If I was going to use the above and not restore the global $post variable (wp_reset_postdata) it will more then likely raise issues with the main WordPress core loop query (to alter the main query view about pre_get_posts).
echo get_the_post_thumbnail( get_queried_object_id() );
Pieter highlighted that by using $post it is not reliable due to the fact that many use (knowing or unknowingly) $post as a local variable which will break the $post global.
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