Yup, your errors are because we made b2evolution compatible with PHP7 and now you need to make your plugins compatible with PHP7 too.

You probably only need to add the & $params part to the 3 functions in your plugin that throw an error.

Markdown is not mandatory and you are welcome to type in HTML code in the plain/markup editor instead.

Ok that seems simple enough, and did clear those error messages but,

I then received

Warning: Missing argument 1 for mytags_plugin::SkinBeginHtmlHead(), called in /home/calstock/public_html/plugins/_mytags.plugin.php on line 118 and defined in /home/calstock/public_html/plugins/_mytags.plugin.php on line 88

Line 88 is function SkinBeginHtmlHead( & $params )

Line 117: function AdminEndHtmlHead( & $params ) {
Line 118:       $this->SkinBeginHtmlHead();
Line 119:      }

I tried adding the & $params to the function call at Line 118: but received

Fatal error: Call-time pass-by-reference has been removed in /home/calstock/public_html/plugins/_mytags.plugin.php on line 118

UPDATE 1:

Despite the warning, using the first option, the plugin seems to be working, so how do I get rid of the warning which shows only in the back office?

UPDATE 2: AH! Modified Line 118 to $this->SkinBeginHtmlHead($params); i.e. without the & and the warning has gone, so Missing argument 1 is $params

All seems good for now. Can someone confirm this is the correct solution not just a fluke:

UPDATE 3:
Oops! Yes it's fluke in that any $variable will do. ???

Your "Update 2" seems correct.

But any variable $name will do when calling the function, is that right?

Oh! and got the Turingtest_plugin back up and working with the & $params solution

Thanks

No, the correct variable to use is $params even if anything else //appears// to also work.