Which Function Displays The Post Authors Gravatar

Notice: get_the_author_ID is deprecated since version 2.8! Use
get_the_author_meta('ID') instead. in
C:\Users\Administrator\Desktop\www.wpsites.dev\wp-includes\functions.php
on line 2908

You aren’t using get_the_author_meta('ID'); as instructed by the Notice. You are just using get_the_author_meta(). The latter returns an empty string when I try it.

Reference

http://codex.wordpress.org/Function_Reference/get_the_author_meta

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