Deprecated : The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in /home2/cargocap/mrbuilders.pk/wp-includes/widgets/upgrade/index.php on line 148 Deprecated : The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in /home2/cargocap/mrbuilders.pk/wp-includes/widgets/upgrade/index.php on line 266 Deprecated : The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in /home2/cargocap/mrbuilders.pk/wp-includes/widgets/upgrade/index.php on line 274 /home2/cargocap/rnm-solutions.com/wp-content/plugins/perfmatters/inc/classes/LazyLoad.php
<?php
namespace Perfmatters;
class LazyLoad
{
//initialize lazyload iframe functions
public static function init_iframes()
{
add_action('perfmatters_queue', array('Perfmatters\LazyLoad', 'queue_iframes'));
}
//queue iframe functions
public static function queue_iframes()
{
//check filters
if(empty(apply_filters('perfmatters_lazyload', !empty(Config::$options['lazyload']['lazy_loading_iframes'])))) {
return;
}
//skip woocommerce
if(Utilities::is_woocommerce()) {
return;
}
//check post meta
if(Utilities::get_post_meta('perfmatters_exclude_lazy_loading')) {
return;
}
add_action('perfmatters_output_buffer_template_redirect', array('Perfmatters\LazyLoad', 'iframes_buffer'));
}
//process iframe buffer
public static function iframes_buffer($html) {
$clean_html = Utilities::clean_html($html);
$html = self::lazyload_iframes($html, $clean_html);
$html = self::lazyload_videos($html, $clean_html);
return $html;
}
//lazy load iframes
public static function lazyload_iframes($html, $buffer) {
//match all iframes
preg_match_all('#<iframe(\s.+)>.*</iframe>#iUs', $buffer, $iframes, PREG_SET_ORDER);
if(!empty($iframes)) {
//remove any duplicates
$iframes = array_unique($iframes, SORT_REGULAR);
foreach($iframes as $iframe) {
//get iframe attributes array
$iframe_atts = Utilities::get_atts_array($iframe[1]);
//dont check excluded if forced attribute was found
if(!Utilities::match_in_array($iframe[1], self::lazyload_forced_atts())) {
//skip if exluded attribute was found
if(Utilities::match_in_array($iframe[1], self::lazyload_excluded_atts())) {
continue;
}
//skip if no-lazy class is found
if(!empty($iframe_atts['class']) && strpos($iframe_atts['class'], 'no-lazy') !== false) {
continue;
}
}
//skip if no src is found
if(empty($iframe_atts['src'])) {
continue;
}
//try rendering youtube preview placeholder if we need to
if(!empty(Config::$options['lazyload']['youtube_preview_thumbnails'])) {
$iframe['src'] = trim($iframe_atts['src']);
$iframe_lazyload = self::lazyload_youtube_iframe($iframe);
}
//default iframe placeholder
if(empty($iframe_lazyload)) {
$iframe_atts['class'] = !empty($iframe_atts['class']) ? $iframe_atts['class'] . ' ' . 'perfmatters-lazy' : 'perfmatters-lazy';
//migrate src
$iframe_atts['data-src'] = $iframe_atts['src'];
unset($iframe_atts['src']);
//replace iframe attributes string
$iframe_lazyload = str_replace($iframe[1], ' ' . Utilities::get_atts_string($iframe_atts), $iframe[0]);
//add noscript original iframe
if(apply_filters('perfmatters_lazyload_noscript', true)) {
$iframe_lazyload.= '<noscript>' . $iframe[0] . '</noscript>';
}
}
//replace iframe with placeholder
$html = str_replace($iframe[0], $iframe_lazyload, $html);
unset($iframe_lazyload);
}
}
return $html;
}
//prep youtube iframe for lazy loading
public static function lazyload_youtube_iframe($iframe) {
if(!$iframe) {
return false;
}
//attempt to get the id based on url
$result = preg_match('#^(?:https?:)?(?://)?(?:www\.)?(?:youtu\.be|youtube\.com|youtube-nocookie\.com)/(?:embed/|v/|watch/?\?v=)?([\w-]{11})#iU', $iframe['src'], $matches);
//return false if there is no usable id
if(!$result || $matches[1] === 'videoseries') {
return false;
}
$youtube_id = $matches[1];
//parse iframe src url
$query = wp_parse_url(htmlspecialchars_decode($iframe['src']), PHP_URL_QUERY);
//clean up the url
$parsed_url = wp_parse_url($iframe['src'], -1);
$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '//';
$host = isset($parsed_url['host']) ? $parsed_url['host'] : '';
$path = isset($parsed_url['path']) ? $parsed_url['path'] : '';
$youtube_url = $scheme . $host . $path;
//thumbnail resolutions
$resolutions = array(
'default' => array(
'width' => 120,
'height' => 90,
),
'mqdefault' => array(
'width' => 320,
'height' => 180,
),
'hqdefault' => array(
'width' => 480,
'height' => 360,
),
'sddefault' => array(
'width' => 640,
'height' => 480,
),
'maxresdefault' => array(
'width' => 1280,
'height' => 720,
)
);
//filter set resolution
$resolution = apply_filters('perfmatters_lazyload_youtube_thumbnail_resolution', 'hqdefault');
//finished youtube lazy output
$youtube_lazyload = '<div class="perfmatters-lazy-youtube" data-src="' . esc_attr($youtube_url) . '" data-id="' . esc_attr($youtube_id) . '" data-query="' . esc_attr($query) . '" onclick="perfmattersLazyLoadYouTube(this);">';
$youtube_lazyload.= '<div>';
$youtube_lazyload.= '<img src="https://i.ytimg.com/vi/' . esc_attr($youtube_id) .'/' . $resolution . '.jpg" alt="YouTube ' . __('video', 'perfmatters') . '" width="' . $resolutions[$resolution]['width'] . '" height="' . $resolutions[$resolution]['height'] . '" data-pin-nopin="true" nopin="nopin">';
$youtube_lazyload.= '<div class="play"></div>';
$youtube_lazyload.= '</div>';
$youtube_lazyload.= '</div>';
//noscript tag
if(apply_filters('perfmatters_lazyload_noscript', true)) {
$youtube_lazyload.= '<noscript>' . $iframe[0] . '</noscript>';
}
return $youtube_lazyload;
}
//lazy load videos
public static function lazyload_videos($html, $buffer) {
//match all videos
preg_match_all('#<video(\s.+)>.*</video>#iUs', $buffer, $videos, PREG_SET_ORDER);
if(!empty($videos)) {
//remove any duplicates
$videos = array_unique($videos, SORT_REGULAR);
foreach($videos as $video) {
//get video attributes array
$video_atts = Utilities::get_atts_array($video[1]);
//dont check excluded if forced attribute was found
if(!Utilities::match_in_array($video[1], self::lazyload_forced_atts())) {
//skip if exluded attribute was found
if(Utilities::match_in_array($video[1], self::lazyload_excluded_atts())) {
continue;
}
//skip if no-lazy class is found
if(!empty($video_atts['class']) && strpos($video_atts['class'], 'no-lazy') !== false) {
continue;
}
}
//skip if no src is found
if(empty($video_atts['src'])) {
continue;
}
//add lazyload class
$video_atts['class'] = !empty($video_atts['class']) ? $video_atts['class'] . ' ' . 'perfmatters-lazy' : 'perfmatters-lazy';
//migrate src
$video_atts['data-src'] = $video_atts['src'];
unset($video_atts['src']);
//migrate poster
if(!empty($video_atts['poster'])) {
$video_atts['data-poster'] = $video_atts['poster'];
unset($video_atts['poster']);
}
//replace video attributes string
$video_lazyload = str_replace($video[1], ' ' . Utilities::get_atts_string($video_atts), $video[0]);
//add noscript original video
if(apply_filters('perfmatters_lazyload_noscript', true)) {
$video_lazyload .= '<noscript>' . $video[0] . '</noscript>';
}
//replace video with placeholder
$html = str_replace($video[0], $video_lazyload, $html);
unset($video_lazyload);
}
}
return $html;
}
//initialize lazy loading
public static function init_images()
{
add_action('perfmatters_queue', array('Perfmatters\LazyLoad', 'queue_images'));
}
//queue image functions
public static function queue_images()
{
//check filters
if(empty(apply_filters('perfmatters_lazyload', !empty(Config::$options['lazyload']['lazy_loading']) || !empty(Config::$options['lazyload']['lazy_loading_iframes']) || !empty(Config::$options['lazyload']['css_background_images'])))) {
return;
}
//skip woocommerce
if(Utilities::is_woocommerce()) {
return;
}
//check post meta
if(Utilities::get_post_meta('perfmatters_exclude_lazy_loading')) {
return;
}
//disable wp native lazy loading
add_filter('wp_lazy_loading_enabled', '__return_false');
//actions + filters
add_action('perfmatters_output_buffer_template_redirect', array('Perfmatters\LazyLoad', 'lazyload_buffer'));
add_action('wp_enqueue_scripts', array('Perfmatters\LazyLoad', 'enqueue_scripts'));
add_filter('script_loader_tag', array('Perfmatters\LazyLoad', 'async_script'), 10, 2);
add_action('wp_head', array('Perfmatters\LazyLoad', 'lazyload_css'), PHP_INT_MAX);
//images only
if(!empty(Config::$options['lazyload']['lazy_loading'])) {
add_filter('wp_get_attachment_image_attributes', function($attr) {
unset($attr['loading']);
return $attr;
});
}
}
//lazy load buffer
public static function lazyload_buffer($html) {
$buffer = Utilities::clean_html($html);
//replace image tags
if(!empty(Config::$options['lazyload']['lazy_loading'])) {
$html = self::lazyload_parent_leading_exclusions($html, $buffer);
$html = self::lazyload_parent_exclusions($html, $buffer);
$html = self::lazyload_pictures($html, $buffer);
$html = self::lazyload_background_images($html, $buffer);
$html = self::lazyload_images($html, $buffer);
}
//replace css background elements
if(!empty(Config::$options['lazyload']['css_background_images'])) {
$html = self::lazyload_css_background_images($html, $buffer);
}
return $html;
}
//enqueue lazy load script
public static function enqueue_scripts() {
wp_register_script('perfmatters-lazy-load', plugins_url('perfmatters/js/lazyload.min.js'), array(), PERFMATTERS_VERSION, true);
wp_enqueue_script('perfmatters-lazy-load');
wp_add_inline_script('perfmatters-lazy-load', self::inline_js(), 'before');
}
//add async tag to enqueued script
public static function async_script($tag, $handle) {
if($handle !== 'perfmatters-lazy-load') {
return $tag;
}
return str_replace(' src', ' async src', $tag);
}
//print lazy load styles
public static function lazyload_css() {
//print noscript styles
if(apply_filters('perfmatters_lazyload_noscript', true)) {
echo '<noscript><style>.perfmatters-lazy[data-src]{display:none !important;}</style></noscript>';
}
$styles = '';
//youtube thumbnails
if(!empty(Config::$options['lazyload']['lazy_loading_iframes']) && !empty(Config::$options['lazyload']['youtube_preview_thumbnails'])) {
$styles.= '.perfmatters-lazy-youtube{position:relative;width:100%;max-width:100%;height:0;padding-bottom:56.23%;overflow:hidden}.perfmatters-lazy-youtube img{position:absolute;top:0;right:0;bottom:0;left:0;display:block;width:100%;max-width:100%;height:auto;margin:auto;border:none;cursor:pointer;transition:.5s all;-webkit-transition:.5s all;-moz-transition:.5s all}.perfmatters-lazy-youtube img:hover{-webkit-filter:brightness(75%)}.perfmatters-lazy-youtube .play{position:absolute;top:50%;left:50%;right:auto;width:68px;height:48px;margin-left:-34px;margin-top:-24px;background:url('.plugins_url('perfmatters/img/youtube.svg').') no-repeat;background-position:center;background-size:cover;pointer-events:none;filter:grayscale(1)}.perfmatters-lazy-youtube:hover .play{filter:grayscale(0)}.perfmatters-lazy-youtube iframe{position:absolute;top:0;left:0;width:100%;height:100%;z-index:99}';
if(current_theme_supports('responsive-embeds') || in_array('wp-embed-responsive', get_body_class())) {
$styles.= '.wp-has-aspect-ratio .wp-block-embed__wrapper{position:relative;}.wp-has-aspect-ratio .perfmatters-lazy-youtube{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;padding-bottom:0}';
}
}
//fade in effect
if(!empty(Config::$options['lazyload']['fade_in'])) {
$styles.= '.perfmatters-lazy.pmloaded,.perfmatters-lazy.pmloaded>img,.perfmatters-lazy>img.pmloaded,.perfmatters-lazy[data-ll-status=entered]{animation:' . apply_filters('perfmatters_fade_in_speed', 500) . 'ms pmFadeIn}@keyframes pmFadeIn{0%{opacity:0}100%{opacity:1}}';
}
//css background images
if(!empty(Config::$options['lazyload']['css_background_images'])) {
$styles.='body .perfmatters-lazy-css-bg:not([data-ll-status=entered]),body .perfmatters-lazy-css-bg:not([data-ll-status=entered]) *,body .perfmatters-lazy-css-bg:not([data-ll-status=entered])::before,body .perfmatters-lazy-css-bg:not([data-ll-status=entered])::after{background-image:none!important;will-change:transform;transition:opacity 0.025s ease-in,transform 0.025s ease-in!important;}';
}
//print styles
if(!empty($styles)) {
echo '<style>' . $styles . '</style>';
}
}
//inline lazy load js
private static function inline_js() {
$threshold = apply_filters('perfmatters_lazyload_threshold', !empty(Config::$options['lazyload']['threshold']) ? Config::$options['lazyload']['threshold'] : '0px');
if(ctype_digit($threshold)) {
$threshold.= 'px';
}
//declare lazy load options
$output = 'window.lazyLoadOptions={elements_selector:"img[data-src],.perfmatters-lazy,.perfmatters-lazy-css-bg",thresholds:"' . $threshold . ' 0px",class_loading:"pmloading",class_loaded:"pmloaded",callback_loaded:function(element){if(element.tagName==="IFRAME"){if(element.classList.contains("pmloaded")){if(typeof window.jQuery!="undefined"){if(jQuery.fn.fitVids){jQuery(element).parent().fitVids()}}}}}};';
//lazy loader initialized
$output.= 'window.addEventListener("LazyLoad::Initialized",function(e){var lazyLoadInstance=e.detail.instance;';
//dom monitoring
if(!empty(Config::$options['lazyload']['lazy_loading_dom_monitoring']) || !empty(Config::$options['lazyload']['elements'])) {
$output.= 'var target=document.querySelector("body");var observer=new MutationObserver(function(mutations){lazyLoadInstance.update()});var config={childList:!0,subtree:!0};observer.observe(target,config);';
}
$output.= '});';
//youtube thumbnails
if(!empty(Config::$options['lazyload']['lazy_loading_iframes']) && !empty(Config::$options['lazyload']['youtube_preview_thumbnails'])) {
$autoplay = apply_filters('perfmatters_lazyload_youtube_autoplay', true);
$output.= 'function perfmattersLazyLoadYouTube(e){var t=document.createElement("iframe"),r="ID?";r+=0===e.dataset.query.length?"":e.dataset.query+"&"' . ($autoplay ? ',r+="autoplay=1"' : '') . ',t.setAttribute("src",r.replace("ID",e.dataset.src)),t.setAttribute("frameborder","0"),t.setAttribute("allowfullscreen","1"),t.setAttribute("allow","accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"),e.replaceChild(t,e.firstChild)}';
}
return $output;
}
//lazy load img tags
private static function lazyload_images($html, $buffer) {
//match all img tags
preg_match_all('#<img([^>]+?)\/?>#is', $buffer, $images, PREG_SET_ORDER);
if(!empty($images)) {
$lazy_image_count = 0;
$exclude_leading_images = apply_filters('perfmatters_exclude_leading_images', Config::$options['lazyload']['exclude_leading_images'] ?? 0);
$leading_image_exclusions = apply_filters('perfmatters_leading_image_exclusions', array(
'data-perfmatters-leading-skip'
));
//remove any duplicate images
$images = array_unique($images, SORT_REGULAR);
//loop through images
foreach($images as $image) {
$leading = true;
//check for leading image exclusion
if(!empty($leading_image_exclusions) && is_array($leading_image_exclusions)) {
foreach($leading_image_exclusions as $exclusion) {
if(strpos($image[0], $exclusion) !== false) {
$leading = false;
}
}
}
//skip leading images
if($leading) {
$lazy_image_count++;
if($lazy_image_count <= $exclude_leading_images) {
continue;
}
}
//prepare lazy load image
$lazy_image = self::lazyload_image($image);
//replace image in html
$html = str_replace($image[0], $lazy_image, $html);
}
}
return $html;
}
//lazy load picture tags for webp
private static function lazyload_pictures($html, $buffer) {
//match all picture tags
preg_match_all('#<picture(.*)?>(.*)<\/picture>#isU', $buffer, $pictures, PREG_SET_ORDER);
if(!empty($pictures)) {
foreach($pictures as $picture) {
//get picture tag attributes
$picture_atts = Utilities::get_atts_array($picture[1]);
//dont check excluded if forced attribute was found
if(!Utilities::match_in_array($picture[1], self::lazyload_forced_atts())) {
//skip if no-lazy class is found
if((!empty($picture_atts['class']) && strpos($picture_atts['class'], 'no-lazy') !== false) || Utilities::match_in_array($picture[0], self::lazyload_excluded_atts())) {
//mark image for exclusion later
preg_match('#<img([^>]+?)\/?>#is', $picture[0], $image);
if(!empty($image)) {
$image_atts = Utilities::get_atts_array($image[1]);
$image_atts['class'] = (!empty($image_atts['class']) ? $image_atts['class'] . ' ' : '') . 'no-lazy';
$new_image = sprintf('<img %1$s />', Utilities::get_atts_string($image_atts));
$html = str_replace($image[0], $new_image, $html);
}
continue;
}
}
//match all source tags inside the picture
preg_match_all('#<source(\s.+)>#isU', $picture[2], $sources, PREG_SET_ORDER);
if(!empty($sources)) {
//remove any duplicate sources
$sources = array_unique($sources, SORT_REGULAR);
foreach($sources as $source) {
//skip if exluded attribute was found
if(Utilities::match_in_array($source[1], self::lazyload_excluded_atts())) {
continue;
}
//migrate srcet
$new_source = preg_replace('/([\s"\'])srcset/i', '${1}data-srcset', $source[0]);
//migrate sizes
$new_source = preg_replace('/([\s"\'])sizes/i', '${1}data-sizes', $new_source);
//replace source in html
$html = str_replace($source[0], $new_source, $html);
}
}
else {
continue;
}
}
}
return $html;
}
//lazy load background images
private static function lazyload_background_images($html, $buffer) {
//match all elements with inline styles
//preg_match_all('#<(?<tag>div|figure|section|span|li)(\s+[^>]+[\'"\s]?style\s*=\s*[\'"].*?background-image.*?[\'"][^>]*)>#is', $buffer, $elements, PREG_SET_ORDER); //alternate to possibly filter some out that don't have background images???
preg_match_all('#<(?<tag>div|figure|section|span|li|a)(\s+[^>]*[\'"\s]?style\s*=\s*[\'"].*?[\'"][^>]*)>#is', $buffer, $elements, PREG_SET_ORDER);
if(!empty($elements)) {
foreach($elements as $element) {
//get element tag attributes
$element_atts = Utilities::get_atts_array($element[2]);
//dont check excluded if forced attribute was found
if(!Utilities::match_in_array($element[2], self::lazyload_forced_atts())) {
//skip if no-lazy class is found
if(!empty($element_atts['class']) && strpos($element_atts['class'], 'no-lazy') !== false) {
continue;
}
//skip if exluded attribute was found
if(Utilities::match_in_array($element[2], self::lazyload_excluded_atts())) {
continue;
}
}
//skip if no style attribute
if(!isset($element_atts['style'])) {
continue;
}
//match background-image in style string
preg_match('#(([^;\s])*background(-(image|url))?)\s*:\s*(\s*url\s*\((?<url>[^)]+)\))\s*;?#is', $element_atts['style'], $url);
if(!empty($url)) {
$url['url'] = trim($url['url'], '\'" ');
//add lazyload class
$element_atts['class'] = !empty($element_atts['class']) ? $element_atts['class'] . ' ' . 'perfmatters-lazy' : 'perfmatters-lazy';
//remove background image url from inline style attribute
$element_atts['style'] = str_replace($url[0], '', $element_atts['style']);
//migrate src
$element_atts['data-bg'] = esc_url(trim(strip_tags(html_entity_decode($url['url'], ENT_QUOTES|ENT_HTML5)), '\'" '));
if(!empty($url[2])) {
$element_atts['data-bg-var'] = $url[1];
}
//build lazy element
$lazy_element = sprintf('<' . $element['tag'] . ' %1$s >', Utilities::get_atts_string($element_atts));
//replace element with placeholder
$html = str_replace($element[0], $lazy_element, $html);
unset($lazy_element);
}
else {
continue;
}
}
}
return $html;
}
//prep img tag for lazy loading
private static function lazyload_image($image) {
//if there are no attributes, return original match
if(empty($image[1])) {
return $image[0];
}
//get image attributes array
$image_atts = Utilities::get_atts_array($image[1]);
//get new attributes
if(empty($image_atts['src']) || (!Utilities::match_in_array($image[1], self::lazyload_forced_atts()) && ((!empty($image_atts['class']) && strpos($image_atts['class'], 'no-lazy') !== false) || Utilities::match_in_array($image[1], self::lazyload_excluded_atts()) || (!empty($image_atts['fetchpriority']) && $image_atts['fetchpriority'] == 'high')))) {
return $image[0];
}
else {
//add lazyload class
$image_atts['class'] = !empty($image_atts['class']) ? $image_atts['class'] . ' ' . 'perfmatters-lazy' : 'perfmatters-lazy';
//migrate src
$image_atts['data-src'] = $image_atts['src'];
//add placeholder src
$width = !empty($image_atts['width']) ? $image_atts['width'] : 0;
$height = !empty($image_atts['height']) ? $image_atts['height'] : 0;
$image_atts['src'] = "data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='" . $width . "'%20height='" . $height . "'%20viewBox='0%200%20" . $width . "%20" . $height . "'%3E%3C/svg%3E";
//migrate srcset
if(!empty($image_atts['srcset'])) {
$image_atts['data-srcset'] = $image_atts['srcset'];
unset($image_atts['srcset']);
}
//migrate sizes
if(!empty($image_atts['sizes'])) {
$image_atts['data-sizes'] = $image_atts['sizes'];
unset($image_atts['sizes']);
}
//unset existing loading attribute
if(isset($image_atts['loading'])) {
unset($image_atts['loading']);
}
}
//replace attributes
$output = sprintf('<img %1$s />', Utilities::get_atts_string($image_atts));
//original noscript image
if(apply_filters('perfmatters_lazyload_noscript', true)) {
$output.= "<noscript>" . $image[0] . "</noscript>";
}
return $output;
}
//lazy load css background images
private static function lazyload_css_background_images($html, $buffer) {
if(!empty(Config::$options['lazyload']['css_background_selectors'])) {
//match all selectors
preg_match_all('#<(?>div|section|figure|footer)(\s[^>]*?(' . implode('|', Config::$options['lazyload']['css_background_selectors']) . ').*?)>#i', $buffer, $selectors, PREG_SET_ORDER);
if(!empty($selectors)) {
foreach($selectors as $selector) {
$selector_atts = Utilities::get_atts_array($selector[1]);
//skip if no-lazy class is found
if(!empty($selector_atts['class']) && strpos($selector_atts['class'], 'no-lazy') !== false) {
continue;
}
$selector_atts['class'] = !empty($selector_atts['class']) ? $selector_atts['class'] . ' ' . 'perfmatters-lazy-css-bg' : 'perfmatters-lazy-css-bg';
//replace video attributes string
$selector_lazyload = str_replace($selector[1], ' ' . Utilities::get_atts_string($selector_atts), $selector[0]);
//replace video with placeholder
$html = str_replace($selector[0], $selector_lazyload, $html);
unset($selector_lazyload);
}
}
}
return $html;
}
//initialize lazy loading elements
public static function init_elements()
{
add_action('perfmatters_queue', array('Perfmatters\LazyLoad', 'queue_elements'));
}
//queue element functions
public static function queue_elements()
{
//check filters
if(empty(apply_filters('perfmatters_lazyload', !empty(Config::$options['lazyload']['elements'])))) {
return;
}
if(empty(apply_filters('perfmatters_lazy_elements', !empty(Config::$options['lazyload']['elements'])))) {
return;
}
//skip woocommerce
if(Utilities::is_woocommerce()) {
return;
}
//check post meta
if(Utilities::get_post_meta('perfmatters_exclude_lazy_loading')) {
return;
}
//actions + filters
add_action('perfmatters_output_buffer_template_redirect', array('Perfmatters\LazyLoad', 'lazyload_elements'));
//disable wp rocket lazy render for compatibility
add_filter('rocket_lrc_optimization', '__return_false', 999);
}
//lazy load elements
public static function lazyload_elements($html) {
if(!empty(Config::$options['lazyload']['elements'])) {
$selectors = array(
'perfmatters-lazy-element',
);
//get exclusions added from settings
if(!empty(Config::$options['lazyload']['element_selectors']) && is_array(Config::$options['lazyload']['element_selectors'])) {
$selectors = array_unique(array_merge($selectors, Config::$options['lazyload']['element_selectors']));
}
//filter final exclusions array
$selectors = apply_filters('perfmatters_lazy_element_selectors', $selectors);
foreach($selectors as $selector) {
//get all elements with the selector
$elements = HTML::get_selector_elements($html, $selector);
if(!empty($elements)) {
foreach($elements as $element) {
if(strpos($element, 'data-perfmatters-lazy-element') === false) {
$lazy_element = '<div data-perfmatters-lazy-element style="height:1000px; width:100%;"><noscript>' . str_replace('noscript', 'pmnoscript', $element) . '</noscript></div>';
$html = str_replace($element, $lazy_element, $html);
}
}
}
}
if(!empty($lazy_element)) {
$script = '<script id="perfmatters-lazy-elements-js" defer>!function(){var e=document.querySelectorAll("div[data-perfmatters-lazy-element]");if(e.length){var t=new IntersectionObserver((function(e,t){e.forEach((function(e){if(e.isIntersecting){var r=e.target.querySelector("noscript");if(r){var n,o=(new DOMParser).parseFromString(r.textContent.replaceAll("pmnoscript","noscript"),"text/html");(n=e.target).replaceWith.apply(n,o.body.childNodes)}t.unobserve(e.target)}}))}),{root:null,rootMargin:"300px 0px"});e.forEach((function(e){return t.observe(e)}))}}();</script>';
//add inline script to body tag
$html = str_replace('</body>', $script . '</body>', $html);
}
}
return $html;
}
//exclude images from leading image exclusions by parent selector
private static function lazyload_parent_leading_exclusions($html, &$buffer) {
$parent_exclusions = apply_filters('perfmatters_leading_image_parent_exclusions', array());
if(!empty($parent_exclusions)) {
//clean html doc
$clean_dom = new \DOMDocument();
$clean_dom->loadHTML($buffer, LIBXML_SCHEMA_CREATE | LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD | LIBXML_NOERROR | LIBXML_ERR_NONE);
$xpath = new \DOMXpath($clean_dom);
//search for excluded parents
array_walk($parent_exclusions, function(&$exclusion) {
$exclusion = 'contains(@*, "' . $exclusion . '")';
});
$exclusion_string = implode(' or ', $parent_exclusions);
$elements = $xpath->query("//div[" . $exclusion_string . "]|//section[" . $exclusion_string . "]|//figure[" . $exclusion_string . "]");
if(!is_null($elements)) {
//create main html DOMDocument to match and update in parallel
$dom = new \DOMDocument();
$dom->loadHTML($html, LIBXML_SCHEMA_CREATE | LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD | LIBXML_NOERROR | LIBXML_ERR_NONE);
$html_new = '<!DOCTYPE html>' . $dom->saveHTML($dom->documentElement);
$image_excluded = false;
//search for images inside parents
foreach($elements as $element) {
$images = $element->getElementsByTagName('img');
if(!empty($images)) {
for($i = $images->length; --$i >= 0;) {
//add skip attribute to image in both documents
$image = $images->item($i);
$image_html_prev = $clean_dom->saveHTML($image);
$image->setAttribute('data-perfmatters-leading-skip', 1);
$image_html_new = $clean_dom->saveHTML($image);
$html_new = str_replace($image_html_prev, $image_html_new, $html_new);
}
$image_excluded = true;
}
}
}
//have excluded images
if($image_excluded) {
//save both html copies
$html = $html_new;
$buffer = $clean_dom->saveHTML();
}
}
return $html;
}
//mark images inside parent exclusions as no-lazy
private static function lazyload_parent_exclusions($html, &$buffer) {
if(!empty(Config::$options['lazyload']['lazy_loading_parent_exclusions'])) {
//match all selectors
preg_match_all('#<(div|section|figure)(\s[^>]*?(' . implode('|', Config::$options['lazyload']['lazy_loading_parent_exclusions']) . ').*?)>.*?<img.*?<\/\g1>#is', $buffer, $selectors, PREG_SET_ORDER);
if(!empty($selectors)) {
foreach($selectors as $selector) {
//match all img tags
preg_match_all('#<img([^>]+?)\/?>#is', $selector[0], $images, PREG_SET_ORDER);
if(!empty($images)) {
//remove any duplicate images
$images = array_unique($images, SORT_REGULAR);
//loop through images
foreach($images as $image) {
$image_atts = Utilities::get_atts_array($image[1]);
$image_atts['class'] = !empty($image_atts['class']) ? $image_atts['class'] . ' ' . 'no-lazy' : 'no-lazy';
//replace video attributes string
$new_image = str_replace($image[1], ' ' . Utilities::get_atts_string($image_atts), $image[0]);
//replace video with placeholder
$html = str_replace($image[0], $new_image, $html);
unset($new_image);
}
}
}
}
}
return $html;
}
//get forced attributes
private static function lazyload_forced_atts() {
return apply_filters('perfmatters_lazyload_forced_attributes', array());
}
//get excluded attributes
private static function lazyload_excluded_atts() {
//base exclusions
$attributes = array(
'data-perfmatters-preload',
'gform_ajax_frame',
';base64',
'skip-lazy',
'fetchpriority="high"'
);
//get exclusions added from settings
if(!empty(Config::$options['lazyload']['lazy_loading_exclusions']) && is_array(Config::$options['lazyload']['lazy_loading_exclusions'])) {
$attributes = array_unique(array_merge($attributes, Config::$options['lazyload']['lazy_loading_exclusions']));
}
return apply_filters('perfmatters_lazyload_excluded_attributes', $attributes);
}
}