diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/blocks/post-author-biography.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/blocks/post-author-biography.php	Tue Sep 27 16:37:53 2022 +0200
@@ -0,0 +1,48 @@
+<?php
+/**
+ * Server-side rendering of the `core/post-author-biography` block.
+ *
+ * @package WordPress
+ */
+
+/**
+ * Renders the `core/post-author-biography` block on the server.
+ *
+ * @param  array    $attributes Block attributes.
+ * @param  string   $content    Block default content.
+ * @param  WP_Block $block      Block instance.
+ * @return string Returns the rendered post author biography block.
+ */
+function render_block_core_post_author_biography( $attributes, $content, $block ) {
+	if ( ! isset( $block->context['postId'] ) ) {
+		return '';
+	}
+
+	$author_id = get_post_field( 'post_author', $block->context['postId'] );
+	if ( empty( $author_id ) ) {
+		return '';
+	}
+
+	$author_biography = get_the_author_meta( 'description', $author_id );
+	if ( empty( $author_biography ) ) {
+		return '';
+	}
+
+	$align_class_name   = empty( $attributes['textAlign'] ) ? '' : "has-text-align-{$attributes['textAlign']}";
+	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $align_class_name ) );
+
+	return sprintf( '<div %1$s>', $wrapper_attributes ) . $author_biography . '</div>';
+}
+
+/**
+ * Registers the `core/post-author-biography` block on the server.
+ */
+function register_block_core_post_author_biography() {
+	register_block_type_from_metadata(
+		__DIR__ . '/post-author-biography',
+		array(
+			'render_callback' => 'render_block_core_post_author_biography',
+		)
+	);
+}
+add_action( 'init', 'register_block_core_post_author_biography' );