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Example of wordpress theme function file for several optimizations
/*
DO NOT COPY\PASTE. Take only what you need carefully.
The following code is just a few **examples** of optimizations that you can do in functions.php file.
*/
<?php
// disable google fonts
add_filter( 'elementor/frontend/print_google_fonts', '__return_false' );
// disable eicons
add_action( 'elementor/frontend/after_enqueue_styles', 'js_dequeue_eicons' );
function js_dequeue_eicons() {
// Don't remove it in the backend
if ( is_admin() || current_user_can( 'manage_options' ) ) {
return;
}
wp_dequeue_style( 'elementor-icons' );
}
add_action( 'elementor/frontend/after_register_styles',function() {
foreach( [ 'solid', 'regular', 'brands' ] as $style ) {
wp_deregister_style( 'elementor-icons-fa-' . $style );
}
}, 20 );
add_action( 'wp_enqueue_scripts', 'replace_font_awesome', 3 );
add_action( 'elementor/frontend/after_enqueue_styles', function () { wp_dequeue_style( 'font-awesome' ); } );
function replace_font_awesome() {
wp_enqueue_style( 'font-awesome', '../../fonts/swift-performance/fontawesome/webfont.css' );
}
add_action( 'wp_enqueue_scripts', 'remove_default_stylesheet', 20 );
function remove_default_stylesheet() {
wp_deregister_style( 'elementor-icons' );
}
function add_favicon() {
echo '<link rel="shortcut icon" type="image/webp" href="data:image/webp;base64,UklGRnID...........AAAAAAAAAAAA="/>';
}
add_action('wp_head', 'add_favicon');
/*remove query string */
function _remove_script_version( $src ){
$parts = explode( '?ver', $src );
return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );
/* disable feeds and remove them from head */
function itsme_disable_feed() {
wp_die(__('No feed available, please visit the <a href="' . esc_url(home_url('/')) . '">homepage</a>!'));
}
add_action('do_feed', 'itsme_disable_feed', 1);
add_action('do_feed_rdf', 'itsme_disable_feed', 1);
add_action('do_feed_rss', 'itsme_disable_feed', 1);
add_action('do_feed_rss2', 'itsme_disable_feed', 1);
add_action('do_feed_atom', 'itsme_disable_feed', 1);
add_action('do_feed_rss2_comments', 'itsme_disable_feed', 1);
add_action('do_feed_atom_comments', 'itsme_disable_feed', 1);
remove_action( 'wp_head', 'feed_links_extra', 3 );
remove_action( 'wp_head', 'feed_links', 2 );
/*RSD is a discovery service that helps discover Pingbacks and XML-RPC on WordPress blogs*/
remove_action( 'wp_head', 'rsd_link' );
/* remove version from head */
remove_action('wp_head', 'wp_generator');
// remove version from rss
add_filter('the_generator', '__return_empty_string');
// remove version from scripts and styles
function remove_version_scripts_styles ($src) {
if (strpos($src, 'ver=')) {
$src = remove_query_arg('ver', $src);
}
return $src;
}
add_filter('style_loader_src', 'remove_version_scripts_styles', 9999);
add_filter('script_loader_src', 'remove_version_scripts_styles', 9999);
if (!is_admin()) {
add_filter( 'script_loader_tag', function ( $tag, $handle ) {
if ( strpos( $tag, "jquery.js" ) ||
strpos( $tag, "other tags that you want") ) {
return $tag;
}
return str_replace( ' src', ' defer="defer" src', $tag );
}, 10, 2 );
}
// Windows Live Writer
remove_action('wp_head', 'wlwmanifest_link');
// Remove short link
add_filter('after_setup_theme', 'remove_redundant_shortlink');
function remove_redundant_shortlink() {
// remove HTML meta tag
// <link rel='shortlink' rel="noopener" href='http://example.com/?p=25' />
remove_action('wp_head', 'wp_shortlink_wp_head', 10);
// remove HTTP header
// Link: <https://example.com/?p=25>; rel=shortlink
remove_action( 'template_redirect', 'wp_shortlink_header', 11);
}
// Disable self pingback
function no_self_ping( &$links ) {
$home = get_option( 'home' );
foreach ( $links as $l => $link )
if ( 0 === strpos( $link, $home ) )
unset($links[$l]);
}
add_action( 'pre_ping', 'no_self_ping' );
// remove rest API
add_action('after_setup_theme', function(){
remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
});
// remove dashicons
add_action( 'wp_enqueue_scripts', 'deregister_dashicon' );
function deregister_dashicon() {
if (current_user_can( 'update_core' )) {
return;
}
wp_deregister_style('dashicons');
}
/*Enable upload for webp image files*/
function webp_upload_mimes($existing_mimes) {
$existing_mimes['webp'] = 'image/webp';
return $existing_mimes;
}
add_filter('mime_types', 'webp_upload_mimes');
/* Enable preview / thumbnail for webp image files*/
function webp_is_displayable($result, $path) {
if ($result === false) {
$displayable_image_types = array( IMAGETYPE_WEBP );
$info = @getimagesize( $path );
if (empty($info)) {
$result = false;
} elseif (!in_array($info[2], $displayable_image_types)) {
$result = false;
} else {
$result = true;
}
}
return $result;
}
add_filter('file_is_displayable_image', 'webp_is_displayable', 10, 2);
function preconnect() {
echo '<link rel="preconnect" href="//www.google-analytics.com" crossorigin>';
}
add_action( 'wp_head', 'preconnect' );
// Adding DNS Prefetching
function dns_prefetch() {
echo '<meta https-equiv="x-dns-prefetch-control" content="on">
<link rel="dns-prefetch" href="//fonts.googleapis.com" />
<link rel="dns-prefetch" href="//fonts.gstatic.com" />
<link rel="dns-prefetch" href="//0.gravatar.com/" />
<link rel="dns-prefetch" href="//2.gravatar.com/" />
<link rel="dns-prefetch" href="//1.gravatar.com/" />
<link rel="dns-prefetch" href="//maps.googleapis.com/" />
<link rel="dns-prefetch" href="//maps.google.com/" />
<link rel="dns-prefetch" href="//maps.gstatic.com/" />
<link rel="dns-prefetch" href="//disqus.com/" />
<link rel="dns-prefetch" href="//go.disqus.com/" />';
}
add_action('wp_head', 'dns_prefetch', 0);
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