Sync Acronym

[fejan-malek]

#745

Below Changes done in this pull request

• Updated the Markdown file.
• New test cases added and removed tests which are not mentioned in test.toml

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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[fejan-malek]

@mk-mxp Should I update the example code here?

Please review thanks!

[mk-mxp]

Please review thanks!

I hope to find time today. I'm busy with working for my living...

[fejan-malek]

@mk-mxp

testUnderscoreEmphasis Is working correctly?

Should I also add in not included in test.toml? If yes then what is the reason because it running with the existing solution?

[mk-mxp]

No underscores, please. Reasons:

The example.php is an internal solution, showing that

• it is possible to solve the exercise in PHP
• a solution exists, that runs fast enough for exercisms infrastructure

It is not enough, that example.php can handle the new tests. We need to look at the community solutions for very common solutions.

There are currently about 350 different community solutions (see https://exercism.org/tracks/php/build > "Practice Exercises" > 106 active exercises > Acronym). These are shown partially on the exercise community solutions page (see https://exercism.org/tracks/php/exercises/acronym/solutions when you have solved the exercise / are not logged in). Many of them use preg_*() functions and rely on the word boundary detection (\w and others) of PCRE. An underscore is not seen as a word boundary by PCRE, so these solutions fail.

[mk-mxp]

Why haven't I seen this earlier? Shame on me...

[mk-mxp]

Thank you for contribution!