My WordPress ‘cleanup’ script
13th May, 2015
I include the following, or something similar, in most of my WordPress projects. It standardises some awkward behaviours, removes some superfluous settings and capabilities, and enhances/improves some default functions and approaches.
Warning – do not simply copy and paste this into your theme/functions; it’ll need adapting to fit your use-case, and will likely cause as many problems as it solves if not tweaked and refined to fit your needs.
/**
* Removes WP cruft
*/
class Cruft {
/**
* Register the integration.
*
* @return void
*/
public static function register() : void {
$instance = new self();
// Filters.
add_filter( 'wp_print_styles', array( $instance, 'remove_gutenberg_cruft' ), 100 );
add_filter( 'sanitize_file_name', array( $instance, 'force_lowercase_filenames' ), 10, 1 );
add_filter( 'should_load_separate_core_block_assets', '__return_true' ); // Optimize block resource loading.
// Chunkier functions.
$instance->remove_emoji_cruft();
$instance->remove_head_cruft();
$instance->disable_xmlrpc();
}
/**
* Disable XMLRPC functionality
*
* @return void
*/
private function disable_xmlrpc() : void {
// Disable on the back end.
add_filter( 'xmlrpc_enabled', '__return_false' );
add_filter( 'pre_option_enable_xmlrpc', '__return_false' );
// Disable the methods.
add_filter(
'xmlrpc_methods',
function( $methods ) {
unset( $methods['pingback.ping'] );
unset( $methods['pingback.extensions.getPingbacks'] );
return $methods;
}
);
// Remove the header link.
add_filter(
'bloginfo_url',
function( $output, $property ) {
return ( $property == 'pingback_url' ) ? '#' : $output;
},
11,
2
);
// Remove the HTTP header.
add_filter(
'wp',
function() {
header_remove( 'X-Pingback' );
},
9999
);
}
/**
* Remove Gutenberg CSS
*
* @return void
*/
public function remove_gutenberg_cruft() : void {
wp_deregister_style( 'wp-block-library' );
wp_deregister_style( 'wp-block-library-theme' );
wp_deregister_style( 'wp-block-library-css' );
wp_deregister_style( 'wp-block-paragraph' );
wp_deregister_style( 'classic-theme-styles' );
wp_deregister_style( 'global-styles' );
wp_dequeue_style( 'wp-block-library' );
wp_dequeue_style( 'wp-block-library-theme' );
wp_dequeue_style( 'wp-block-library-css' );
wp_dequeue_style( 'classic-theme-styles' );
wp_dequeue_style( 'wp-block-paragraph' );
wp_dequeue_style( 'global-styles' );
}
/**
* Renames uploaded media to use lowercase URLs
*
* @param string $filename The filename.
*
* @return string The modified filename
*/
public function force_lowercase_filenames( $filename ) {
$info = pathinfo( $filename );
$ext = empty( $info['extension'] ) ? '' : '.' . $info['extension'];
$name = basename( $filename, $ext );
return strtolower( $name ) . $ext;
}
/**
* Remove inline emoji scripts & styles
*
* @return void
*/
private function remove_emoji_cruft() : void {
remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
remove_action( 'wp_print_styles', 'print_emoji_styles' );
remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
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_filter( 'wp_resource_hints', array( $this, 'remove_emoji_dns_prefetch' ), 10, 2 );
}
/**
* Removes some unused DNS prefetch hints
*
* @param array $hints The hints.
*
* @param string $relation_type The type of hint.
*
* @return array The modified hints
*/
public function remove_emoji_dns_prefetch( $hints, $relation_type ) {
if ( 'dns-prefetch' === $relation_type ) {
$matches = preg_grep( '/emoji/', $hints );
return array_diff( $hints, $matches );
}
return $hints;
}
/**
* Disables pingback headers
*
* @param array $headers The headers.
*
* @return array The modified headers
*/
public function remove_x_pingback( $headers ) {
unset( $headers['X-Pingback'] );
return $headers;
}
/**
* Removes cruft from the <head>
*
* @return void
*/
private function remove_head_cruft() : void {
remove_action( 'wp', 'rsd_link', 9 );
remove_action( 'wp_head', 'wlwmanifest_link' );
remove_action( 'wp_head', 'wp_shortlink_wp_head', 10 );
remove_action( 'wp_head', 'wp_generator' );
remove_action( 'wp_head', 'feed_links', 2 );
remove_action( 'wp_head', 'feed_links_extra', 3 );
remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
remove_action( 'template_redirect', 'rest_output_link_header', 11, 0 );
remove_action( 'template_redirect', 'wp_shortlink_header', 11 );
remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head' );
add_filter( 'wp_headers', array( $this, 'remove_x_pingback' ), 10, 1 );
}
}
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