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wp-content/plugins/jetpack/extensions/blocks/related-posts/render.php

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+<?php
+/**
+ * Related Posts block render implementation.
+ *
+ * Loaded lazily from related-posts.php only when the block is rendered, to keep
+ * the render body out of the eager front-end PHP/opcache footprint.
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\RelatedPosts;
+
+use Automattic\Jetpack\Modules;
+use Automattic\Jetpack\Status\Host;
+use WP_Block;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Related Posts block render callback.
+ *
+ * @param array    $attributes Array containing the Button block attributes.
+ * @param string   $content    The block content.
+ * @param WP_Block $block    The block object.
+ *
+ * @return string
+ */
+function render_block_implementation( $attributes, $content, $block ) {
+	// If the Related Posts module is not active, don't render the block.
+	if (
+		! ( new Host() )->is_wpcom_simple()
+		&& ! ( new Modules() )->is_active( 'related-posts' )
+	) {
+		return '';
+	}
+
+	// If the Related Posts option is turned off, don't render the block.
+	$options = \Jetpack_Options::get_option( 'relatedposts', array() );
+	if ( empty( $options['enabled'] ) || ! $options['enabled'] ) {
+		return '';
+	}
+
+	if ( ! class_exists( 'Jetpack_RelatedPosts' ) ) {
+		require_once JETPACK__PLUGIN_DIR . 'modules/related-posts/jetpack-related-posts.php';
+	}
+
+	return \Jetpack_RelatedPosts::init()->render_block( $attributes, $content, $block );
+}