og image code when image in subfolders on PC

[graphicz]

I have this included in my header code for product pages:

<meta property="og:image" content="<actinic:variable name="CatalogURL" /><actinic:block php="true" >$path_parts = pathinfo('<actinic:variable name="ProductImageFileName" encoding="perl" selectable="false" />');echo $path_parts['basename'], "\n";</actinic:block>" />

Works fine when images are in the Site1 folder but my client has multiple folders so on the live site the url is this:

http://79.170.44.130/clientaddress.co.uk/acatalog/NOT_CATALOG/Product%20Images/Pencarrie/Thumbnail/599B_th.jpg

I have tried

<meta property="og:image" content="<actinic:variable name="CatalogURL" /><actinic:block php="true">echo basename(str_replace('\\','/', '<actinic:variable name="ProductImageFileName" encoding="perl" selectable="false" />'));</actinic:block>" />

but same result - therefore image not found.

How can I specify just the image filename without the folder names?

The result I would like is this

http://79.170.44.130/clientaddress.co.uk/acatalog/599B_th.jpg

Thank you