Dome/Zeitfresser-Wordpress-Theme
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Zeitfresser-Wordpress-Theme/functions.php
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Dome e1f7db91f8 fix(performance): delete all original image subsizes during cleanup 
- Extend cleanup logic to remove full original image family (including subsizes)
- Fix issue where only the main original file was deleted
- Ensure consistent behavior for both manual batch processing and auto-delete
- Improve cleanup safety by validating optimization state before deletion
2026-04-25 10:19:33 +02:00

795 lines
22 KiB
PHP
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<?php
/**
* Zeitfresser theme functions and definitions.
*
* @package zeitfresser
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
if ( ! defined( 'ZEITFRESSER_VERSION' ) ) {
define( 'ZEITFRESSER_VERSION', '2.3.6' );
}
if ( ! defined( 'DAISY_BLOG_VERSION' ) ) {
define( 'DAISY_BLOG_VERSION', ZEITFRESSER_VERSION );
}
if ( ! defined( 'ZEITFRESSER_IMAGE_OPTIMIZATION_VERSION' ) ) {
define( 'ZEITFRESSER_IMAGE_OPTIMIZATION_VERSION', '1.0' );
}
require get_template_directory() . '/inc/zeitfresser-helpers.php';
require get_template_directory() . '/inc/performance-tools.php';
require get_template_directory() . '/inc/zeitfresser-toc.php';
/**
* Upload Handler
*/
add_filter('wp_handle_upload', 'zeitfresser_capture_original_upload', 10, 2);
/**
* Capture original upload path safely
*/
function zeitfresser_capture_original_upload( $upload, $context ) {
if ( empty( $upload['file'] ) ) {
return $upload;
}
// Store temporarily (request-scoped)
$GLOBALS['zeitfresser_last_uploaded_file'] = $upload['file'];
return $upload;
}
add_filter( 'wp_handle_upload', 'zeitfresser_capture_original_upload', 10, 2 );
/**
* Persist original file path to attachment meta
*/
function zeitfresser_store_original_file( $attachment_id ) {
if ( ! wp_attachment_is_image( $attachment_id ) ) {
return;
}
if ( empty( $GLOBALS['zeitfresser_last_uploaded_file'] ) ) {
return;
}
$file = $GLOBALS['zeitfresser_last_uploaded_file'];
// Safety: ensure file still exists
if ( ! file_exists( $file ) ) {
return;
}
// Prevent overwrite if already set
if ( get_post_meta( $attachment_id, '_zeitfresser_original_file', true ) ) {
return;
}
update_post_meta(
$attachment_id,
'_zeitfresser_original_file',
$file
);
}
add_action( 'add_attachment', 'zeitfresser_store_original_file' );
/**
* Theme setup.
*
* @return void
*/
function zeitfresser_setup() {
load_theme_textdomain( 'zeitfresser', get_template_directory() . '/languages' );
add_theme_support( 'automatic-feed-links' );
add_theme_support( 'title-tag' );
add_theme_support( 'post-thumbnails' );
add_theme_support(
'html5',
array(
'search-form',
'comment-form',
'comment-list',
'gallery',
'caption',
'style',
'script',
)
);
add_theme_support( 'customize-selective-refresh-widgets' );
add_theme_support(
'custom-logo',
array(
'height' => 250,
'width' => 250,
'flex-width' => true,
'flex-height' => true,
)
);
add_theme_support( 'align-wide' );
add_theme_support( 'wp-block-styles' );
add_theme_support( 'responsive-embeds' );
register_nav_menus(
array(
'menu-1' => esc_html__( 'Primary', 'zeitfresser' ),
)
);
add_editor_style( 'editor-style.css' );
}
add_action( 'after_setup_theme', 'zeitfresser_setup' );
/**
* Register optimized image sizes
*/
function zeitfresser_custom_image_sizes() {
// Content images (main article)
add_image_size( 'zeitfresser-content', 720, 0, false );
// Archive / card layout
add_image_size( 'zeitfresser-card', 480, 0, false );
}
add_action( 'after_setup_theme', 'zeitfresser_custom_image_sizes' );
/**
* Set the content width in pixels.
*
* @return void
*/
function zeitfresser_content_width() {
$GLOBALS['content_width'] = apply_filters( 'zeitfresser_content_width', 640 );
}
add_action( 'after_setup_theme', 'zeitfresser_content_width', 0 );
/**
* Register widget area.
*
* @return void
*/
function zeitfresser_widgets_init() {
register_sidebar(
array(
'name' => esc_html__( 'Sidebar', 'zeitfresser' ),
'id' => 'sidebar-1',
'description' => esc_html__( 'Add widgets here.', 'zeitfresser' ),
'before_widget' => '<section id="%1$s" class="widget %2$s">',
'after_widget' => '</section>',
'before_title' => '<h4 class="widget-title">',
'after_title' => '</h4>',
)
);
}
add_action( 'widgets_init', 'zeitfresser_widgets_init' );
/**
* Enqueue floating TOC assets on single posts.
*
* @return void
*/
function zeitfresser_enqueue_toc_assets() {
if ( is_singular( 'post' ) && zeitfresser_has_floating_toc() ) {
wp_enqueue_script(
'zeitfresser-toc',
get_template_directory_uri() . '/js/toc.js',
array(),
ZEITFRESSER_VERSION,
true
);
}
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_enqueue_toc_assets', 20 );
/**
* Return file version using filemtime in production-safe form.
*
* @param string $relative_path Relative file path inside the theme.
* @return string
*/
function zeitfresser_asset_version( $relative_path ) {
$path = get_template_directory() . $relative_path;
return file_exists( $path ) ? (string) filemtime( $path ) : ZEITFRESSER_VERSION;
}
/**
* Enqueue scripts and styles.
*
* @return void
*/
function zeitfresser_scripts() {
wp_enqueue_style(
'zeitfresser',
get_template_directory_uri() . '/style.css',
array(),
zeitfresser_asset_version( '/style.css' )
);
wp_enqueue_script(
'zeitfresser-navigation',
get_template_directory_uri() . '/js/navigation.js',
array(),
zeitfresser_asset_version( '/js/navigation.js' ),
true
);
if ( is_home() || is_front_page() || is_archive() || is_search() ) {
wp_enqueue_script(
'zeitfresser-masonry',
get_template_directory_uri() . '/js/masonry.pkgd.min.js',
array(),
zeitfresser_asset_version( '/js/masonry.pkgd.min.js' ),
true
);
}
wp_enqueue_script(
'zeitfresser-scripts',
get_template_directory_uri() . '/js/scripts.js',
array(),
zeitfresser_asset_version( '/js/scripts.js' ),
true
);
if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
wp_enqueue_script( 'comment-reply' );
}
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_scripts', 10 );
/**
* Load RTL stylesheet from /css folder
*/
function zeitfresser_rtl_styles() {
if ( is_rtl() ) {
wp_enqueue_style(
'zeitfresser-rtl',
get_template_directory_uri() . '/css/style-rtl.css',
array('zeitfresser'),
filemtime(get_template_directory() . '/css/style-rtl.css')
);
}
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_rtl_styles', 11 );
function zeitfresser_enqueue_static_colors() {
wp_enqueue_style(
'zeitfresser-colors',
get_template_directory_uri() . '/css/colors.css',
array('zeitfresser'),
file_exists(get_template_directory() . '/css/colors.css')
? filemtime(get_template_directory() . '/css/colors.css')
: ZEITFRESSER_VERSION
);
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_enqueue_static_colors', 20 );
function zeitfresser_enqueue_static_fonts() {
wp_enqueue_style(
'zeitfresser-fonts',
get_template_directory_uri() . '/css/fonts.css',
array(),
file_exists(get_template_directory() . '/css/fonts.css')
? filemtime(get_template_directory() . '/css/fonts.css')
: ZEITFRESSER_VERSION
);
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_enqueue_static_fonts', 15 );
/**
* Theme package marker kept for compatibility with the original premium controls.
*
* @return string
*/
function zeitfresser_free_pro() {
return 'pro';
}
require get_template_directory() . '/inc/template-tags.php';
require get_template_directory() . '/inc/template-functions.php';
require get_template_directory() . '/inc/customizer.php';
if ( defined( 'JETPACK__VERSION' ) ) {
require get_template_directory() . '/inc/jetpack.php';
}
require get_template_directory() . '/inc/blocks/blocks.php';
require get_template_directory() . '/inc/pagination.php';
/**
* Add safe front-end performance optimizations.
*
* @return void
*/
function zeitfresser_performance_setup() {
// Disable the legacy embeds script on the front end. Native iframes still work.
if ( ! is_admin() ) {
wp_deregister_script( 'wp-embed' );
}
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_performance_setup', 100 );
/**
* Remove unnecessary head output for a leaner front end.
*
* @return void
*/
function zeitfresser_cleanup_wp_head() {
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_action( 'wp_head', 'rsd_link' );
remove_action( 'wp_head', 'wlwmanifest_link' );
remove_action( 'wp_head', 'wp_generator' );
remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
remove_action( 'wp_head', 'wp_shortlink_wp_head', 10 );
remove_action( 'wp_head', 'wp_oembed_add_discovery_links', 10 );
remove_action( 'wp_head', 'wp_oembed_add_host_js' );
remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 );
}
add_action( 'init', 'zeitfresser_cleanup_wp_head' );
/**
* Preload critical local fonts only
*/
function zeitfresser_preload_fonts() {
?>
<!-- Critical Fonts Only -->
<link rel="preload" href="<?php echo get_template_directory_uri(); ?>/fonts/oswald-400.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="<?php echo get_template_directory_uri(); ?>/fonts/oswald-700.woff2" as="font" type="font/woff2" crossorigin>
<link rel="preload" href="<?php echo get_template_directory_uri(); ?>/fonts/roboto-400.woff2" as="font" type="font/woff2" crossorigin>
<?php
}
add_action('wp_head', 'zeitfresser_preload_fonts', 1);
/**
* Optimize font loading with preconnect
*/
add_filter( 'wp_resource_hints', function( $urls, $relation_type ) {
if ( 'preconnect' === $relation_type ) {
$urls[] = [
'href' => get_template_directory_uri(),
'crossorigin' => 'anonymous',
];
}
return $urls;
}, 10, 2 );
/**
* Remove front-end dashicons for visitors.
*
* @return void
*/
function zeitfresser_maybe_dequeue_dashicons() {
if ( ! is_user_logged_in() ) {
wp_deregister_style( 'dashicons' );
}
}
add_action( 'wp_enqueue_scripts', 'zeitfresser_maybe_dequeue_dashicons', 100 );
/**
* Improve image decoding defaults without changing visual output.
*
* @param array $attr Image markup attributes.
* @param WP_Post $attachment Attachment post object.
* @param string|array $size Requested image size.
* @return array
*/
function zeitfresser_optimize_image_attributes( $attr, $attachment, $size ) {
if ( empty( $attr['decoding'] ) ) {
$attr['decoding'] = 'async';
}
if ( empty( $attr['loading'] ) && ! is_admin() ) {
$attr['loading'] = 'lazy';
}
return $attr;
}
add_filter( 'wp_get_attachment_image_attributes', 'zeitfresser_optimize_image_attributes', 10, 3 );
/**
* Lower the threshold for WordPress scaled originals when auto optimization is enabled.
*
* When automatic optimization is disabled, original uploads should remain untouched.
*
* @return int|false
*/
function zeitfresser_big_image_size_threshold() {
if ( ! get_theme_mod( 'ztfr_auto_optimize', true ) ) {
return false;
}
return 1800;
}
add_filter( 'big_image_size_threshold', 'zeitfresser_big_image_size_threshold' );
/**
* Skip generating oversized core intermediate sizes we do not use.
*
* @param array $sizes Registered intermediate sizes.
* @return array
*/
function zeitfresser_filter_intermediate_image_sizes( $sizes ) {
// Remove oversized defaults
unset(
$sizes['1536x1536'],
$sizes['2048x2048']
);
return $sizes;
}
add_filter( 'intermediate_image_sizes_advanced', 'zeitfresser_filter_intermediate_image_sizes' );
/**
* Convert generated JPEG and PNG files to AVIF/WebP when enabled.
*
* Auto optimization can be disabled for uploads via Customizer.
* Manual optimization may still force conversion through a request-scoped flag.
*
* @param array $formats Output format map.
* @return array
*/
function zeitfresser_image_output_format( $formats ) {
$auto_enabled = get_theme_mod( 'ztfr_auto_optimize', true );
$force_enabled = ! empty( $GLOBALS['zeitfresser_force_image_optimization'] );
if ( ! $auto_enabled && ! $force_enabled ) {
return $formats;
}
if ( function_exists( 'wp_image_editor_supports' ) ) {
// Prefer AVIF if supported.
if ( wp_image_editor_supports( array( 'mime_type' => 'image/avif' ) ) ) {
$formats['image/jpeg'] = 'image/avif';
$formats['image/png'] = 'image/avif';
// Fallback to WebP.
} elseif ( wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
$formats['image/jpeg'] = 'image/webp';
$formats['image/png'] = 'image/webp';
}
}
return $formats;
}
add_filter( 'image_editor_output_format', 'zeitfresser_image_output_format' );
/**
* Mark images as optimized only when optimization is actually active.
*
* @param array $metadata Attachment metadata.
* @param int $attachment_id Attachment ID.
* @return array
*/
function zeitfresser_mark_new_images_optimized( $metadata, $attachment_id ) {
if ( ! wp_attachment_is_image( $attachment_id ) ) {
return $metadata;
}
$auto_enabled = get_theme_mod( 'ztfr_auto_optimize', true );
$force_enabled = ! empty( $GLOBALS['zeitfresser_force_image_optimization'] );
if ( ! $auto_enabled && ! $force_enabled ) {
return $metadata;
}
update_post_meta(
$attachment_id,
'_zeitfresser_media_optimized_version',
ZEITFRESSER_IMAGE_OPTIMIZATION_VERSION
);
return $metadata;
}
add_filter( 'wp_generate_attachment_metadata', 'zeitfresser_mark_new_images_optimized', 20, 2 );
/**
* Auto Optimize Hook
*/
add_filter(
'wp_generate_attachment_metadata',
'zeitfresser_auto_optimize_on_upload',
15,
2
);
function zeitfresser_auto_optimize_on_upload( $metadata, $attachment_id ) {
// 🔒 only images
if ( ! wp_attachment_is_image( $attachment_id ) ) {
return $metadata;
}
// 🔒 feature toggle
if ( ! get_theme_mod( 'ztfr_auto_optimize', true ) ) {
return $metadata;
}
$file = get_attached_file( $attachment_id );
if ( ! $file || ! file_exists( $file ) ) {
return $metadata;
}
// 🔥 DO NOT overwrite upload-captured original
if ( ! get_post_meta( $attachment_id, '_zeitfresser_original_file', true ) ) {
// fallback only
update_post_meta( $attachment_id, '_zeitfresser_original_file', $file );
}
// mark as optimized
update_post_meta(
$attachment_id,
'_zeitfresser_media_optimized_version',
ZEITFRESSER_IMAGE_OPTIMIZATION_VERSION
);
return $metadata;
}
/**
* Auto Delete Hook
*/
add_filter(
'wp_generate_attachment_metadata',
'zeitfresser_auto_delete_original_after_upload',
30,
2
);
function zeitfresser_auto_delete_original_after_upload( $metadata, $attachment_id ) {
if ( ! wp_attachment_is_image( $attachment_id ) ) {
return $metadata;
}
if ( ! get_theme_mod( 'ztfr_auto_optimize', true ) ) {
return $metadata;
}
if ( ! get_theme_mod( 'ztfr_auto_delete', false ) ) {
return $metadata;
}
$original = get_post_meta(
$attachment_id,
'_zeitfresser_original_file',
true
);
if ( ! $original ) {
return $metadata;
}
$ext = strtolower( pathinfo( $original, PATHINFO_EXTENSION ) );
if ( in_array( $ext, [ 'webp', 'avif' ], true ) ) {
update_post_meta( $attachment_id, '_zeitfresser_original_deleted', 1 );
return $metadata;
}
// If nothing remains, mark as completed.
if ( ! zeitfresser_original_family_exists( $attachment_id, $original ) ) {
update_post_meta( $attachment_id, '_zeitfresser_original_deleted', 1 );
return $metadata;
}
zeitfresser_delete_original_family_files( $attachment_id, $original );
// Only mark as deleted when all original-format files are gone.
if ( ! zeitfresser_original_family_exists( $attachment_id, $original ) ) {
update_post_meta( $attachment_id, '_zeitfresser_original_deleted', 1 );
}
return $metadata;
}
/**
* Keep generated image quality balanced for file size and visual fidelity.
*
* @param int $quality Proposed image quality.
* @param string $mime_type Image mime type.
* @return int
*/
function zeitfresser_image_quality( $quality, $mime_type = 'image/jpeg' ) {
switch ( $mime_type ) {
case 'image/avif':
return 50;
case 'image/webp':
return 75;
case 'image/jpeg':
default:
return 82;
}
}
add_filter( 'wp_editor_set_quality', 'zeitfresser_image_quality', 10, 2 );
/**
* Improve attachment image attributes for layout stability and fetch priority.
*
* @param array $attr Image markup attributes.
* @param WP_Post $attachment Attachment post object.
* @param string|array $size Requested image size.
* @return array
*/
function zeitfresser_improve_attachment_dimensions( $attr, $attachment, $size ) {
if ( empty( $attr['width'] ) || empty( $attr['height'] ) ) {
$metadata = wp_get_attachment_metadata( $attachment->ID );
if ( is_array( $metadata ) && ! empty( $metadata['width'] ) && ! empty( $metadata['height'] ) ) {
if ( empty( $attr['width'] ) ) {
$attr['width'] = (int) $metadata['width'];
}
if ( empty( $attr['height'] ) ) {
$attr['height'] = (int) $metadata['height'];
}
}
}
if ( empty( $attr['fetchpriority'] ) && ! is_admin() && ! is_feed() ) {
static $did_set_high_priority = false;
if ( ! $did_set_high_priority && is_singular() ) {
$attr['fetchpriority'] = 'high';
$did_set_high_priority = true;
}
}
return $attr;
}
add_filter( 'wp_get_attachment_image_attributes', 'zeitfresser_improve_attachment_dimensions', 11, 3 );
/**
* Improve responsive image sizes attribute.
*
* @param string $sizes Existing sizes attribute.
* @param array $size Requested image size.
* @return string
*/
function zeitfresser_responsive_image_sizes( $sizes, $size ) {
// Single post content
if ( is_singular() ) {
return '(max-width: 768px) 100vw, (max-width: 1200px) 720px, 720px';
}
// Archive / blog overview
if ( is_home() || is_front_page() || is_archive() || is_search() ) {
return '(max-width: 768px) 100vw, (max-width: 1200px) 50vw, 400px';
}
return $sizes;
}
add_filter( 'wp_calculate_image_sizes', 'zeitfresser_responsive_image_sizes', 10, 2 );
/**
* Determine the most likely LCP image URL.
*
* @return string
*/
function zeitfresser_get_lcp_image_url() {
// Single posts/pages → featured image
if ( is_singular() ) {
$post_id = get_queried_object_id();
if ( $post_id && has_post_thumbnail( $post_id ) ) {
return get_the_post_thumbnail_url( $post_id, 'large' );
}
}
// Archives / homepage → first post with thumbnail
if ( is_home() || is_front_page() || is_archive() || is_search() ) {
global $wp_query;
if ( ! empty( $wp_query->posts ) ) {
foreach ( $wp_query->posts as $post ) {
if ( has_post_thumbnail( $post->ID ) ) {
return get_the_post_thumbnail_url( $post->ID, 'medium_large' );
}
}
}
}
return '';
}
/**
* Preload the most likely LCP image for archive and singular views.
*
* @param array $resources Existing preload resources.
* @return array
*/
function zeitfresser_preload_resources( $resources ) {
if ( is_admin() || is_feed() || is_embed() ) {
return $resources;
}
// 🔥 NEW: use smart detection
$image_url = zeitfresser_get_lcp_image_url();
if ( empty( $image_url ) ) {
return $resources;
}
// Robust extension detection
$extension = strtolower(
pathinfo(
wp_parse_url( $image_url, PHP_URL_PATH ),
PATHINFO_EXTENSION
)
);
// MIME fallback
$image_type = 'image/jpeg';
if ( 'png' === $extension ) {
$image_type = 'image/png';
} elseif ( 'webp' === $extension ) {
$image_type = 'image/webp';
} elseif ( 'avif' === $extension ) {
$image_type = 'image/avif';
}
$resources[] = array_filter(
array(
'href' => esc_url( $image_url ),
'as' => 'image',
'type' => $image_type,
'fetchpriority' => 'high',
)
);
return $resources;
}
add_filter( 'wp_preload_resources', 'zeitfresser_preload_resources' );
/**
* Improve script loading strategy for non-critical assets.
*
* @param array $tag Script tag markup.
* @param string $handle Script handle.
* @param string $src Script source URL.
* @return string
*/
function zeitfresser_defer_non_critical_scripts( $tag, $handle, $src ) {
$deferred_handles = array(
'zeitfresser-navigation',
'zeitfresser-masonry',
'zeitfresser-scripts',
);
if ( in_array( $handle, $deferred_handles, true ) && false === strpos( $tag, ' defer' ) ) {
return str_replace( ' src=', ' defer src=', $tag );
}
return $tag;
}
add_filter( 'script_loader_tag', 'zeitfresser_defer_non_critical_scripts', 10, 3 );
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