functions.php Snippet Generator

<?php
/**
 * Site tweaks.
 *
 * These belong in a site specific plugin rather than a theme's functions.php:
 * the behaviour here is not the theme's, and it should survive a redesign.
 */

/**
 * The excerpt length, in words.
 *
 * Priority 999 because themes filter this too, and the last one wins.
 *
 * @param int $length Current length.
 * @return int
 */
function my_site_excerpt_length( $length ) {
	return 30;
}
add_filter( 'excerpt_length', 'my_site_excerpt_length', 999 );

/**
 * What an automatic excerpt ends with.
 *
 * @param string $more Current ending.
 * @return string
 */
function my_site_excerpt_more( $more ) {
	return '…';
}
add_filter( 'excerpt_more', 'my_site_excerpt_more' );

/**
 * Hides the toolbar from anyone who cannot edit.
 *
 * It pushes the page down 32 pixels for people who have no use for it.
 *
 * @param bool $show Whether to show it.
 * @return bool
 */
function my_site_hide_admin_bar( $show ) {
	if ( current_user_can( 'edit_posts' ) ) {
		return $show;
	}

	return false;
}
add_filter( 'show_admin_bar', 'my_site_hide_admin_bar' );

/**
 * Removes the emoji script.
 *
 * Around 12 KB of JavaScript polyfilling emoji for browsers that have
 * supported them natively for years. Emoji still work; only the polyfill goes.
 */
function my_site_remove_emoji() {
	remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
	remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
	remove_action( 'wp_print_styles', 'print_emoji_styles' );
	remove_action( 'admin_print_styles', 'print_emoji_styles' );
	remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
	remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
	remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
}
add_action( 'init', 'my_site_remove_emoji' );

/**
 * Stops the DNS prefetch hint for the emoji CDN that goes with it.
 *
 * @param array  $urls          Hints for this relation.
 * @param string $relation_type The relation.
 * @return array
 */
function my_site_remove_emoji_dns( $urls, $relation_type ) {
	if ( 'dns-prefetch' !== $relation_type ) {
		return $urls;
	}

	return array_filter(
		$urls,
		static function ( $url ) {
			return false === strpos( (string) $url, 's.w.org' );
		}
	);
}
add_filter( 'wp_resource_hints', 'my_site_remove_emoji_dns', 10, 2 );