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

/**
 * Renders the `core/post-comments-count` 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 filtered post comments count for the current post.
 */
function render_block_core_post_comments_count( $attributes, $content, $block ) {
	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}

	$classes = '';
	if ( isset( $attributes['textAlign'] ) ) {
		$classes .= 'has-text-align-' . $attributes['textAlign'];
	}

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );
	return sprintf(
		'<div %1$s>%2$s</div>',
		$wrapper_attributes,
		get_comments_number( $block->context['postId'] )
	);
}

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