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			_inject_theme_attribute_in_block_template_content is private and should not be used in themes or plugins directly.
_inject_theme_attribute_in_block_template_content › WordPress Function
Since5.9.0
Deprecated6.4.0
› _inject_theme_attribute_in_block_template_content ( $template_content )
| Access: | 
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| Parameters: | 
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| Returns: | 
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| Defined at: | 
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| Codex: | 
Parses wp_template content and injects the active theme's stylesheet as a theme attribute into each wp_template_part
Source
function _inject_theme_attribute_in_block_template_content( $template_content ) {
	_deprecated_function(
		__FUNCTION__,
		'6.4.0',
		'traverse_and_serialize_blocks( parse_blocks( $template_content ), "_inject_theme_attribute_in_template_part_block" )'
	);
	$has_updated_content = false;
	$new_content         = '';
	$template_blocks     = parse_blocks( $template_content );
	$blocks = _flatten_blocks( $template_blocks );
	foreach ( $blocks as &$block ) {
		if (
			'core/template-part' === $block['blockName'] &&
			! isset( $block['attrs']['theme'] )
		) {
			$block['attrs']['theme'] = get_stylesheet();
			$has_updated_content     = true;
		}
	}
	if ( $has_updated_content ) {
		foreach ( $template_blocks as &$block ) {
			$new_content .= serialize_block( $block );
		}
		return $new_content;
	}
	return $template_content;
}