WooCommerce - Change Placeholder Image

gistfile1.txt

/*
* goes in theme functions.php or a custom plugin. Replace the image filename/path with your own :)
*
**/
add_action( 'init', 'custom_fix_thumbnail' );
 
function custom_fix_thumbnail() {
  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;
	}
}

and if i want insert a random image of the products automaticaly?

This is such a junk example and could confuse newbie devs. Seriously, wrapping a filter registration to fire on the init action?

@ChrisChiera That's the function that's depreciated, the filter is still correct.

This is what is in woocommerce > includes > wc-product-functions.php around line 282

function wc_placeholder_img_src() {
	return apply_filters( 'woocommerce_placeholder_img_src', WC()->plugin_url() . '/assets/images/placeholder.png' );
}