I and I coding

Though recommended, time and time again. I did not want to register a new widget, or muck about with a child-theme. Just want to inject some data from a posts custom-field into any custom HTML widget I wanted. I know, it would have been easier with a javascript request followed by an append, but I have this little plugin that I toy with you see, and would like to implement that ability there. Could not find what I was looking for, when hunting for examples. Perhaps not asking the right questions, the likely reason, since my Wordpress-fu leaves a lot to be desired. Eventually came up with the following. Embed an element in the custom html widget using your preferred identifier. In my case: <span id="my-custom-post-field-1"></span> Add a new filter to your plugins library, in my case it's a class: add_filter('widget_text', array($this,'mycustompostthing'),10,3); Add a new function to check the text for that identifier, then injec