WordPress at a glance
filter is not described

wp_doing_ajax filter-hook . WP 4.7.0

Filters whether the current request is a WordPress Ajax request.

Usage

add_filter( 'wp_doing_ajax', 'filter_function_name_5251' );
function filter_function_name_5251( $wp_doing_ajax ){
	// filter...

	return $wp_doing_ajax;
}
$wp_doing_ajax(true/false)
Whether the current request is a WordPress Ajax request.

Where the hook is called

wp_doing_ajax()
wp_doing_ajax
wp-includes/load.php 1072
return apply_filters( 'wp_doing_ajax', defined( 'DOING_AJAX' ) && DOING_AJAX );

Where the hook is used (in WP core)

Does not used.