Example of optimizing conditional filters using a Chunk wrapper
<img src="[[[[+src]]:phpthumbof=`[[+thumbOpts]]`]]" alt="[[+alt]]" />[[*page-image:notempty=`
<img
src="[[*page-image:phpthumbof=`w=480h=320`]]"
alt="[[*pagetitle]]"
/>
`]][[[[*page-image:notempty=`$wrapImgThumb?
&src=`*page-image`
&alt=`[[*pagetitle]]`
&thumbOpts=`w=480&h=320`
`]]]]