WooCommerce - Change the placeholder image

gistfile1.aw

/*
 * goes in theme functions.php or a custom plugin. Replace the image filename/path with your own :)
 *
 **/
add_filter('woocommerce_placeholder_img_src', 'custom_woocommerce_placeholder_img_src');

function custom_woocommerce_placeholder_img_src( $src ) {
     
     $upload_dir = wp_upload_dir(); 
     $uploads = untrailingslashit( $upload_dir['baseurl'] ); 
     $src = $uploads . '/2012/07/thumb1.jpg';

     return $src;
}