Adding a favicon to WordPress through functions

favicon.php

<?php



// Setup favicon call
function add_favicon() {
	$favicon_url = get_stylesheet_directory_uri() . '/library/images/favicon.png';
	echo '<link rel="shortcut icon" href="' . $favicon_url . '" />';
}
// Adds favicon to WP Frontend and WP Dashboard
add_action('wp_head', 'add_favicon');
add_action('login_head', 'add_favicon');
add_action('admin_head', 'add_favicon');