Change Woocommerce placeholder image

Woocommerce-filter-placeholder.php

// reference: https://docs.woocommerce.com/document/change-the-placeholder-image/
/**
 * Change the placeholder image
 */

function custom_woocommerce_placeholder_img_src( $src ) {
	$upload_dir = wp_upload_dir();
	$uploads = untrailingslashit( $upload_dir['baseurl'] );
	$src = $uploads . '/assets/images/placeholder.png';
	 
	return $src;
}
add_filter('woocommerce_placeholder_img_src', 'custom_woocommerce_placeholder_img_src');