wp_handle_upload()

wp_handle_upload( array $file, array|false $overrides = false, string|null $time = null ): array

function wp_handle_upload( &$file, $overrides = false, $time = null ) {
	/*
	 *  $_POST['action'] must be set and its value must equal $overrides['action']
	 *  or this:
	 */
	$action = $overrides['action'] ?? 'wp_handle_upload';
	return _wp_handle_upload( $file, $overrides, $time, $action );
}