Forbid using ${string} interpolation

[krzysztofrewak]

PHP has several ways of embedding variables in strings. One of PHP 8.2 RFCs deprecates two ways of doing so, since they are rarely used, and often lead to confusion:

"Hello ${world}";
Deprecated: Using ${} in strings is deprecated

"Hello ${(world)}";
Deprecated: Using ${} (variable variables) in strings is deprecated

To be clear: the two popular ways of string interpolation still work:

"Hello {$world}";
"Hello $world";

It looks that simple_to_complex_string_variable should fix this problem: https://mlocati.github.io/php-cs-fixer-configurator/#version:3.8|fixer:simple_to_complex_string_variable

References:

• https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation