_add_template_loader_filters() │ WP 5.9.0

Adds necessary hooks to resolve '_wp-find-template' requests.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Return

null. Nothing (null).

Usage

_add_template_loader_filters();

Changelog

Since 5.9.0 Introduced.

_add_template_loader_filters() code WP 6.8

wp-includes/block-template.php 
function _add_template_loader_filters() {
	if ( isset( $_GET['_wp-find-template'] ) && current_theme_supports( 'block-templates' ) ) {
		add_action( 'pre_get_posts', '_resolve_template_for_new_post' );
	}
}