Add php in Item HTML parameter

Yes, I'll do this.

But maybe I found a solution.
I create a textarea field in flexicontent (named 'code') with HTML allowed.
And in my item, I can use the Sourcerer button for this field and put my php codes.
And after, I call my field 'code' with {{code}} in Item HTML of my relation field.
By this way, I think I don't need Rereplacer for what I have to do (although Rereplacer is great too for others applications).
Thank to told me about these extensions.

Or I can put my code in a custom html module, and create a field of type Load module.
It's more convenient for what I have to do, for this code is the same for each item.

NOTE: flexicontent loadmodule field can make customizations of a the same module per item !!!!

see description of last parameter !

yes, I have see that.