This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job. You're in the dumb-mistakes-and-gotchas category.
Last Updated: 2024-04-25
I wrote the following code in PHP, assuming it would work based on my experience
in various other languages that support adding strings "foo" + "bar" (i.e. the method String#+)
<? php
url()->current() + "?foo=bar"
This gave the error: cannot add non-numeric
In some programming environments conveniences like the plus symbol are not
available on strings. i.e. It was naive of me to think this was a standard
programming feature. Similarly, it is not a given that there will be Array#+
etc. Always check what operators are available.