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Filename : post-comments-link.php
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<?php
/**
 * Server-side rendering of the `core/post-comments-link` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/post-comments-link` block on the server.
 *
 * @since 6.9.0
 *
 * @param  array    $attributes Block attributes.
 * @param  string   $content    Block default content.
 * @param  WP_Block $block      Block instance.
 * @return string   Returns the rendered link.
 */
function render_block_core_post_comments_link( $attributes, $content, $block ) {
	if (
		! isset( $block->context['postId'] ) ||
		isset( $block->context['postId'] ) &&
		! comments_open( $block->context['postId'] )
	) {
		return '';
	}

	$classes = array();
	if ( isset( $attributes['textAlign'] ) ) {
		$classes[] = 'has-text-align-' . $attributes['textAlign'];
	}
	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
		$classes[] = 'has-link-color';
	}
	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );
	$comments_number    = (int) get_comments_number( $block->context['postId'] );
	$comments_link      = get_comments_link( $block->context['postId'] );
	$post_title         = get_the_title( $block->context['postId'] );
	$comment_html       = '';

	if ( 0 === $comments_number ) {
		$comment_html = sprintf(
			/* translators: %s post title */
			__( 'No comments<span class="screen-reader-text"> on %s</span>' ),
			$post_title
		);
	} else {
		$comment_html = sprintf(
			/* translators: 1: Number of comments, 2: post title */
			_n(
				'%1$s comment<span class="screen-reader-text"> on %2$s</span>',
				'%1$s comments<span class="screen-reader-text"> on %2$s</span>',
				$comments_number
			),
			esc_html( number_format_i18n( $comments_number ) ),
			$post_title
		);
	}

	return '<div ' . $wrapper_attributes . '><a href=' . esc_url( $comments_link ) . '>' . $comment_html . '</a></div>';
}

/**
 * Registers the `core/post-comments-link` block on the server.
 *
 * @since 6.9.0
 */
function register_block_core_post_comments_link() {
	register_block_type_from_metadata(
		__DIR__ . '/post-comments-link',
		array(
			'render_callback' => 'render_block_core_post_comments_link',
		)
	);
}
add_action( 'init', 'register_block_core_post_comments_link' );