php template

<?php
get_header();

if ( 1 == 1 ) {

	echo '<div class="wp-site-blocks">';

		echo preg_replace('!</[^>]+>!', '', do_blocks('<!-- wp:template-part {"slug":"header","tagName":"header", "align":"full", "className":""} /-->'));
			block_template_part( 'header' );
		echo '</header>';

		echo '<main class="alignfull is-layout-constrained">';

		echo preg_replace('!</[^>]+>!', '', do_blocks( '<!-- wp:template-part {"slug":"post-content","tagName":"div", "align":"full", "className":"article-wrapper"} /-->'));
			block_template_part( 'post' );
		echo '</div>';

		print('</main>' );

		echo preg_replace('!</[^>]+>!', '', do_blocks( '<!-- wp:template-part {"slug":"footer", "tagName":"footer", "align":"full", "className":""} /-->'));
			block_template_part( 'footer' );
		print('</footer>' );

	print('</div>' );

} else {

	echo preg_replace('!</[^>]+>!', '', do_blocks('<!-- wp:template-part {"slug":"header","tagName":"header", "align":"full", "className":""} /-->'));
		block_template_part( 'header' );
	echo '</header>';

	if ( have_posts() ) {
		echo '<main class="alignfull is-layout-constrained">';

		while ( have_posts() ) {
			the_post();
			echo preg_replace('!</[^>]+>!', '', do_blocks( '<!-- wp:template-part {"slug":"post-content","tagName":"div", "align":"full", "className":"article-wrapper"} /-->'));
			echo '<article class="wp-block-group alignfull post is-layout-constrained">';

			if( has_post_thumbnail() ) {
				echo '<figure class="wp-block-post-featured-image">';
				the_post_thumbnail('post-thumbnail');
				echo '</figure>';
			}

			echo preg_replace('!</[^>]+>!', '', do_blocks('<!-- wp:template-part {"slug":"header","tagName":"header", "align":"full", "className":""} /-->'));
			the_title( '<h2>', '</h2>' );
			echo '</header>';

			print('<div class="is-layout-constrained alignfull wp-block-post-content">' );
			the_content();
			print('</div>' );

			print('</article>' );
		}
		print('</main>' );
	}
	echo preg_replace('!</[^>]+>!', '', do_blocks( '<!-- wp:template-part {"slug":"footer", "tagName":"footer", "align":"full", "className":""} /-->'));
		block_template_part( 'footer' );
	echo '</footer>';
}
get_footer();