Get Gravatar / Avatar Outside of loop WordPress.

gravatar-avatar-outside-loop.php

<?php
//* Do not copy above. Add the hook where it's going. Change the function name to reflect your situation.


add_action( 'your_hook', 'themeprefix_author_gravatar_outside_loop_single_post' );

//* Author Gravatar/Avatar outside of Loop on Single posts

function themeprefix_author_gravatar_outside_loop_single_post() {
	
	if ( is_single() ) :
	
		global $post;
		
		$author_id     = $post->post_author;
		$author_link   = esc_url( get_author_posts_url( get_the_author_meta( $author_id ) ) );
		$author_avatar = get_avatar( $author_id, 200 );
		
		printf( '<a href="%s">%s</a>', $author_link, $author_avatar );
		
	endif;
}