Warning: A non-numeric value encountered php code example

Example 1: non-numeric value encountered php

Not exactly the issue you had but the same error for people searching.

This happened to me when I spent too much time on JavaScript.

Coming back to PHP I concatenated two strings with "+" instead of "." and got that error.

Example 2: non numeric value encountered php

when this error is occuring make sure not to concatenate
anything like $fname+" "+$lname, we get error when we do
that, so when i did like $fname,$lname i got it perfect.