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Editing: latest-posts.php

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<?php
/**
 * Server-side rendering of the `core/latest-posts` block.
 *
 * @package WordPress
 */

/**
 * The excerpt length set by the Latest Posts core block
 * set at render time and used by the block itself.
 *
 * @var int
 */
global $block_core_latest_posts_excerpt_length;
$block_core_latest_posts_excerpt_length = 0;

/**
 * Callback for the excerpt_length filter used by
 * the Latest Posts block at render time.
 *
 * @since 5.4.0
 *
 * @global int $block_core_latest_posts_excerpt_length Excerpt length set by the Latest Posts core block.
 *
 * @return int Returns the global $block_core_latest_posts_excerpt_length variable
 *             to allow the excerpt_length filter respect the Latest Block setting.
 */
function block_core_latest_posts_get_excerpt_length() {
	global $block_core_latest_posts_excerpt_length;
	return $block_core_latest_posts_excerpt_length;
}

/**
 * Renders the `core/latest-posts` block on server.
 *
 * @since 5.0.0
 *
 * @global WP_Post $post                                   Global post object.
 * @global int     $block_core_latest_posts_excerpt_length Excerpt length set by the Latest Posts core block.
 *
 * @param array $attributes The block attributes.
 *
 * @return string Returns the post content with latest posts added.
 */
function render_block_core_latest_posts( $attributes ) {
	global $post, $block_core_latest_posts_excerpt_length;
	static $rendering_stack = array();

$args = array(
		'posts_per_page'      => $attributes['postsToShow'],
		'post_status'         => 'publish',
		'order'               => $attributes['order'],
		'orderby'             => $attributes['orderBy'],
		'ignore_sticky_posts' => true,
		'no_found_rows'       => true,
	);

$block_core_latest_posts_excerpt_length = $attributes['excerptLength'];
	add_filter( 'excerpt_length', 'block_core_latest_posts_get_excerpt_length', 20 );

if ( ! empty( $attributes['categories'] ) ) {
		$args['category__in'] = array_column( $attributes['categories'], 'id' );
	}
	if ( isset( $attributes['selectedAuthor'] ) ) {
		$args['author'] = $attributes['selectedAuthor'];
	}

$query = new WP_Query( $args );

if ( isset( $attributes['displayFeaturedImage'] ) && $attributes['displayFeaturedImage'] ) {
		update_post_thumbnail_cache( $query );
	}

$list_items_markup = '';
	// Snapshot the current global post so it can be restored after the loop.
	// We use have_posts()/the_post() rather than foreach so that setup_postdata()
	// is called for each post, establishing the correct global context for
	// do_blocks() and other filters that run during full-content rendering.
	$previous_post = $post ?? null;

while ( $query->have_posts() ) {
		$query->the_post();
		$post_link = esc_url( get_permalink() );
		$title     = get_the_title();

if ( ! $title ) {
			$title = __( '(no title)' );
		}

$list_items_markup .= '<li>';

if ( $attributes['displayFeaturedImage'] && has_post_thumbnail() ) {
			$image_style = '';
			if ( isset( $attributes['featuredImageSizeWidth'] ) ) {
				$image_style .= sprintf( 'max-width:%spx;', $attributes['featuredImageSizeWidth'] );
			}
			if ( isset( $attributes['featuredImageSizeHeight'] ) ) {
				$image_style .= sprintf( 'max-height:%spx;', $attributes['featuredImageSizeHeight'] );
			}

$image_classes = 'wp-block-latest-posts__featured-image';
			if ( isset( $attributes['featuredImageAlign'] ) ) {
				$image_classes .= ' align' . $attributes['featuredImageAlign'];
			}

$featured_image = get_the_post_thumbnail(
				null,
				$attributes['featuredImageSizeSlug'],
				array(
					'style' => esc_attr( $image_style ),
				)
			);
			if ( $attributes['addLinkToFeaturedImage'] ) {
				$featured_image = sprintf(
					'<a href="%1$s" aria-label="%2$s">%3$s</a>',
					esc_url( $post_link ),
					esc_attr( $title ),
					$featured_image
				);
			}
			$list_items_markup .= sprintf(
				'<div class="%1$s">%2$s</div>',
				esc_attr( $image_classes ),
				$featured_image
			);
		}

$list_items_markup .= sprintf(
			'<a class="wp-block-latest-posts__post-title" href="%1$s">%2$s</a>',
			esc_url( $post_link ),
			$title
		);

if ( isset( $attributes['displayAuthor'] ) && $attributes['displayAuthor'] ) {
			$author_display_name = get_the_author_meta( 'display_name' );

/* translators: byline. %s: author. */
			$byline = sprintf( __( 'by %s' ), $author_display_name );

if ( ! empty( $author_display_name ) ) {
				$list_items_markup .= sprintf(
					'<div class="wp-block-latest-posts__post-author">%1$s</div>',
					$byline
				);
			}
		}

if ( isset( $attributes['displayPostDate'] ) && $attributes['displayPostDate'] ) {
			$list_items_markup .= sprintf(
				'<time datetime="%1$s" class="wp-block-latest-posts__post-date">%2$s</time>',
				esc_attr( get_the_date( 'c' ) ),
				get_the_date( '' )
			);
		}

if ( isset( $attributes['displayPostContent'] ) && $attributes['displayPostContent']
			&& isset( $attributes['displayPostContentRadio'] ) && 'excerpt' === $attributes['displayPostContentRadio'] ) {

$trimmed_excerpt = get_the_excerpt();

/*
			 * Adds a "Read more" link with screen reader text.
			 * [&hellip;] is the default excerpt ending from wp_trim_excerpt() in Core.
			 */
			if ( str_ends_with( $trimmed_excerpt, ' [&hellip;]' ) ) {
				/** This filter is documented in wp-includes/formatting.php */
				$excerpt_length = (int) apply_filters( 'excerpt_length', $block_core_latest_posts_excerpt_length );
				if ( $excerpt_length <= $block_core_latest_posts_excerpt_length ) {
					$trimmed_excerpt  = substr( $trimmed_excerpt, 0, -11 );
					$trimmed_excerpt .= sprintf(
						/* translators: 1: A URL to a post, 2: Hidden accessibility text: Post title */
						__( '… <a class="wp-block-latest-posts__read-more" href="%1$s" rel="noopener">Read more<span class="screen-reader-text">: %2$s</span></a>' ),
						esc_url( $post_link ),
						esc_html( $title )
					);
				}
			}

if ( post_password_required() ) {
				$trimmed_excerpt = __( 'This content is password protected.' );
			}

$list_items_markup .= sprintf(
				'<div class="wp-block-latest-posts__post-excerpt">%1$s</div>',
				$trimmed_excerpt
			);
		}

if ( isset( $attributes['displayPostContent'] ) && $attributes['displayPostContent']
			&& isset( $attributes['displayPostContentRadio'] ) && 'full_post' === $attributes['displayPostContentRadio'] ) {

if ( post_password_required() ) {
				$post_content = __( 'This content is password protected.' );
			} else {
				$post_id      = get_the_ID();
				$post_content = get_post_field( 'post_content', $post_id, 'raw' );
				// Check if we're already rendering this post to prevent infinite recursion.
				if ( in_array( $post_id, $rendering_stack, true ) ) {
					$post_content = '';
				} else {
					$rendering_stack[] = $post_id;

try {
						// Run through the actions that are typically taken on the_content.
						$post_content = _wp_apply_block_content_filters( $post_content, 'latest-posts' );
					} finally {
						array_pop( $rendering_stack );
					}
				}
			}

$post_content       = str_replace( ']]>', ']]&gt;', $post_content );
			$list_items_markup .= sprintf(
				'<div class="wp-block-latest-posts__post-full-content">%1$s</div>',
				$post_content
			);
		}

$list_items_markup .= "</li>\n";
	}

// Restore the post context that was active before this secondary query.
	// wp_reset_postdata() is intentionally not used here: when this block is
	// rendered inside another post's content (e.g. via do_blocks()), it would
	// restore to the main query post rather than the outer rendering post.
	$post = $previous_post;
	if ( $previous_post instanceof WP_Post ) {
		setup_postdata( $previous_post );
	}

remove_filter( 'excerpt_length', 'block_core_latest_posts_get_excerpt_length', 20 );

$layout             = $attributes['layout'] ?? array();
	$legacy_layout_type = (
		isset( $attributes['postLayout'] ) &&
		'grid' === $attributes['postLayout']
	) ? 'grid' : 'default';
	$layout_type        = $layout['type'] ?? $legacy_layout_type;
	$column_count       = $layout['columnCount'] ?? ( $attributes['columns'] ?? null );

$classes = array( 'wp-block-latest-posts__list' );
	if ( 'grid' === $layout_type ) {
		$classes[] = 'is-grid';
	}
	if ( 'grid' === $layout_type && ! empty( $column_count ) ) {
		$classes[] = sanitize_title( 'columns-' . $column_count );
	}
	if ( 'grid' === $layout_type && ! empty( $column_count ) && ! empty( $layout['minimumColumnWidth'] ) ) {
		$classes[] = 'has-native-responsive-grid';
	}
	if ( isset( $attributes['displayPostDate'] ) && $attributes['displayPostDate'] ) {
		$classes[] = 'has-dates';
	}
	if ( isset( $attributes['displayAuthor'] ) && $attributes['displayAuthor'] ) {
		$classes[] = 'has-author';
	}
	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
		$classes[] = 'has-link-color';
	}

$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );

return sprintf(
		'<ul %1$s>%2$s</ul>',
		$wrapper_attributes,
		$list_items_markup
	);
}

/**
 * Registers the `core/latest-posts` block on server.
 *
 * @since 5.0.0
 */
function register_block_core_latest_posts() {
	register_block_type_from_metadata(
		__DIR__ . '/latest-posts',
		array(
			'render_callback' => 'render_block_core_latest_posts',
		)
	);
}
add_action( 'init', 'register_block_core_latest_posts' );

/**
 * Handles outdated versions of the `core/latest-posts` block by converting
 * attribute `categories` from a numeric string to an array with key `id`.
 *
 * This is done to accommodate the changes introduced in #20781 that sought to
 * add support for multiple categories to the block. However, given that this
 * block is dynamic, the usual provisions for block migration are insufficient,
 * as they only act when a block is loaded in the editor.
 *
 * TODO: Remove when and if the bottom client-side deprecation for this block
 * is removed.
 *
 * @since 5.5.0
 *
 * @param array $block A single parsed block object.
 *
 * @return array The migrated block object.
 */
function block_core_latest_posts_migrate_categories( $block ) {
	if (
		'core/latest-posts' === $block['blockName'] &&
		! empty( $block['attrs']['categories'] ) &&
		is_string( $block['attrs']['categories'] )
	) {
		$block['attrs']['categories'] = array(
			array( 'id' => absint( $block['attrs']['categories'] ) ),
		);
	}

return $block;
}
add_filter( 'render_block_data', 'block_core_latest_posts_migrate_categories' );

Editing: latest-posts.php

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