Carview!

Returns the current version of the block format that the content string is using.

Description

If the string doesn’t contain blocks, it returns 0.

int The block format version is 1 if the content contains one or more blocks, 0 otherwise.

function block_version( $content ) {
	return has_blocks( $content ) ? 1 : 0;
}

Uses	Description
has_blocks()`wp-includes/blocks.php`	Determines whether a post or content string has blocks.

Used by	Description
WP_REST_Templates_Controller::prepare_item_for_response()`wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php`	Prepare a single template output for response
WP_REST_Posts_Controller::prepare_item_for_response()`wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php`	Prepares a single post output for response.

Version	Description
5.0.0	Introduced.