that is a smart solve ,, i like it , i know that is don't best practice and there was more solutions is more readable than it's but this is a new practice and a new way for the solution for me, so i like it.
i know my english language is bad :)

Thanks for this question. At first thought I wanted to ask why the hell is this important?!
But then I tested out the performance differences between == and ===. And (at least with my testing
environment (average time spend for 100.000 comparisons x 1000 tries to have an average result in php8.2) I
was able to find out that == needs only 75% execution time of ===. And I learned about a function
I didn't know before. microtime(true);

So thanks again for your great input!

yes, Strings are always immutable (unchangable)

Oh!, thank you I didn't know range()

But now you do...

Wish I knew the replace method......

why using "===" instead of "==" ?

I googled, and may be understood the patterns problem you mentioned. But this version is same as:
replace(char oldChar, char newChar) right?