38 lines
863 B
PHP
38 lines
863 B
PHP
<?php
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namespace App\Twig\Extension;
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use Twig\Extension\AbstractExtension;
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use Twig\TwigFilter;
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/**
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* class LazyLoadExtension.
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*
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* @author Simon Vieille <simon@deblan.fr>
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*/
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class LazyLoadExtension extends AbstractExtension
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{
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public function getFilters()
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{
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return [
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new TwigFilter('lazy_load', [$this, 'lazyLoad'], ['is_safe' => ['html']]),
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];
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}
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public function lazyLoad($text)
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{
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$text = preg_replace_callback(
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'`<img src="([^"]+)" alt="([^"]+)" />`isU',
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function ($data) {
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$lazy = sprintf('<img class="lazy-img" src="#" data-src="%s" alt="%s" />', $data[1], $data[2]);
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$noScript = sprintf('<noscript>%s</noscript>', $data[0]);
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return $lazy.$noScript;
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},
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$text
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);
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return $text;
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}
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}
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