Yes, I know that, I was just wondering whether it's worth fixing it in one PHP version only.

Funny enough, now that I tested around with a changed version of the random test, I noticed it did not actually work anyway, at all.

The test method providing the real solution was called without $this, and named the same as the real solution (except character case) - which seemed to have called the real solution twice, for $expected and $actual, making the test effectively useless.

While I would technically agree with that, and potentially drop that echo completely without replacement, this has not been added in this PHP8 upgrade translation. If it were to be dropped/replaced, I guess it should be dropped in all versions?

Translated to PHP

Go translation

If you surround your code with three backticks (```), it will put it in a codeblock, which is far easier readable.

See: https://docs.codewars.com/references/markdown#displaying-code

Added.
Also added a specific test case to clarify that uppercase letters not at the beginning of a word would stay uppercase.

Added PHP 8.0 support

This also fixes a bug in the solution (see comment on the fork)

Added PHP 8.0 support

• add PHP opening tags, where suggested by List of PHP Kata to Update
• add required import for PHPUnit

Also, fixed a bug in the solution which only got visible since PHP 8.0, due to slight changes in string to number conversion:
It checked against the wrong element of the matches array, the element at offset 0 is the whole matched string, not the first capture group. So, both checks were using elements off by one.

A small additional simplification, since the regex only captures the number itself, without the optional -, there is no need to check for negative threshold.

Added PHP 8.0 support

Added PHP 8.0 support

• add PHP opening tags, where suggested by List of PHP Kata to Update
• add required import for PHPUnit
• rename tests to match required naming with PHPUnit 9.x

Added PHP 8.0 support

Added PHP 8.0 support

• add PHP opening tags, where suggested by List of PHP Kata to Update
• add required import for PHPUnit
• rename tests to match required naming with PHPUnit 9.x
• replace deprecated string offset access syntax with curly braces

Added PHP 8.0 support

Added PHP 8.0 support

• add PHP opening tags, where suggested by List of PHP Kata to Update
• add required import for PHPUnit
• fix assertion $expected and $actual order (see PHPUnit docs)

Added PHP 8.0 support