Change Default Gravatar
If you want to change the default Gravatar image, use the snippet below:
add_filter( 'avatar_defaults', 'wpkb_change_gravatar' );
function wpkb_change_gravatar ($avatar_defaults) {
$new_gravatar = get_bloginfo('template_directory') . '/images/new_gravatar.gif';
$avatar_defaults[$new_gravatar] = "Gravatar";
return $avatar_defaults;
}
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