> This is a) ten years old, b) fairly out of date, No, most of the problems list...

francislavoie · on March 27, 2022

> [] can be used on any variable, not just strings and arrays. It returns null and issues no warning.

It warns, will likely become an error in a later version (these are being slowly increased in error level to give people time to migrate): https://3v4l.org/qQdSP

> The [] indexing operator can also be spelled {}.

Not anymore: https://3v4l.org/jtjCj

> Unlike (literally!) every other language with a similar operator, ?: is left associative. So this:

Not anymore: https://3v4l.org/t8io2

Regarding string/number comparisons:

https://wiki.php.net/rfc/string_to_number_comparison

conradfr · on March 27, 2022

Most of the things in that article that are still true don't actually come up on a day to day basis for professional coders with a good framework and a decent IDE (basically PhpStorm).