Override default stock message by product id

file.php

//not sure what to do with this code snippet? See https://www.thathandsomebeardedguy.com/what-do-i-do-with-these-code-snippets/
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add_filter( 'woocommerce_get_availability_text', 'handsome_bearded_guy_availability_text', 10, 2 );

		function handsome_bearded_guy_availability_text( $availability, $product ) {
			$oos_replacement_messages = array(//the product id is the array key and the value is the replacement message
				3871 => 'Here on Thursday',
				3870 => 'on back order',
			);
			return array_key_exists( $product->get_id(), $oos_replacement_messages ) ? $oos_replacement_messages[ $product->get_id() ] : $availability;
		}