get total word count from all posts in WordPress

wp-wordcount.php

function getWordCountFromPosts () {
	
	$count = 0;
	$posts = get_posts( array(
			'numberposts' => -1,
			'post_type' => 'any'
	));
	
	foreach( $posts as $post ) {
		$count += str_word_count( strip_tags( get_post_field( 'post_content', $post->ID )));
	}
	$num =  number_format_i18n( $count );
	
	return $num;
}