Inject GenerateBlocks for Reusable Blocks.php

/*** Inject GenerateBlocks for Reusable Blocks
@link https://docs.generateblocks.com/article/adding-content-sources-for-dynamic-css-generation/
Set the CSS Print Method in "GenerateBlocks > Settings" to "Inline Embedding"
–––––––––––––––––––––––––––––––––––––––––––––––––– ***/
add_filter('generateblocks_do_content', function ($content) {
	$post_ids = array();

	if (is_page_template('block-editor-template1.php')) {
		$post_ids = array(12);
	} /* With Sponsor Reusuable Block */

	if (is_page_template('block-editor-template2.php')) {
		$post_ids = array(34);
	} /* MatchPlay Header Reusuable Block */

	if (is_page_template('block-editor-template3.php')) {
		$post_ids = array(56, 87);
	} /* Cup Header & Footer Reusuable Blocks */

	if (is_page_template('block-editor-template4.php')) {
		$post_ids = array(90);
	} /* No Sponsor Reusuable Block */

	foreach ($post_ids as $post_id) {
		if (has_blocks($post_id)) {
			$block_element = get_post($post_id);

			if (!$block_element || 'wp_block' !== $block_element->post_type) {
				return $content;
			}

			if ('publish' !== $block_element->post_status || !empty($block_element->post_password)) {
				return $content;
			}

			$content .= $block_element->post_content;
		}
	}

	return $content;
});


OLD VERSION - One Reusable Block per Page Template
/*** Inject GenerateBlocks for Reusable Blocks
@link https://docs.generateblocks.com/article/adding-content-sources-for-dynamic-css-generation/
Set the CSS Print Method in "GenerateBlocks > Settings" to "Inline Embedding"
–––––––––––––––––––––––––––––––––––––––––––––––––– ***/
add_filter('generateblocks_do_content', function ($content) {
	$post_id = 0;

	if (is_page_template('block-editor-template1.php')) {
		$post_id = 12;
	} /* With Sponsor Reusuable Block */

	if (is_page_template('block-editor-template2.php')) {
		$post_id = 34;
	}

	if (is_page_template('block-editor-template3.php')) {
		$post_id = 56;
	}

	if (is_page_template('block-editor-template4.php')) {
		$post_id = 78;
	} /* No Sponsor Reusuable Block */

	if (has_blocks($post_id)) {
		$block_element = get_post($post_id);

		if (!$block_element || 'wp_block' !== $block_element->post_type) {
			return $content;
		}

		if ('publish' !== $block_element->post_status || !empty($block_element->post_password)) {
			return $content;
		}

		$content .= $block_element->post_content;
	}

	return $content;
});