WordPress Entry Author Template Function

template-tags.php

<?php
if ( ! function_exists( 'theme_slug_entry_author' ) ) :
	/**
	 * Displays the post author
	 */
	function theme_slug_entry_author() {

		$author = sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s" rel="author">%2$s</a></span>',
			esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
			esc_html( get_the_author() )
		);

		$posted_by = sprintf( esc_html_x( 'Published by %s', 'post author', 'theme-slug' ), $author );

		return '<span class="meta-author"> ' . $posted_by . '</span>';
	}
endif;