PHP RFC: Your Title Here

• Version: 0.1
• Date: 2024-09-25
• Author: Yuya Hamada, youkidearitai@gmail.com
• Status: Draft
• First Published at: http://wiki.php.net/rfc/mb_levenshtein

Multibyte levenshtein distances have required Fearue requests in the past. Therefore, we would like to create the mb_levenshtein function to implement this.

ref: https://github.com/php/php-src/issues/10180

There is a levenshtein function, but it does not support multibyte. Therefore, a multibyte-aware version of the mb_levenshtein function is implemented.

Add mb_levenshtein function.

function mb_levenshtein(string $string1, string $string2, int $insertion_cost = 1, int $replacement_cost = 1, int $deletion_cost = 1, ?string $encoding = null): int {}

This could break a function existing in userland with the same name.

PHP 8.5

To SAPIs Will add the aforementioned functions to all PHP environments.

Adds mb_levenshtein() to the mbstring extension.

No effect.

No new constants.

No changed php.ini settings.

https://github.com/php/php-src/issues/10180

This section details areas where the feature might be improved in future, but that are not currently proposed in this RFC.

Include these so readers know where you are heading and can discuss the proposed voting options.

TBD.

TBD.

Userland implementation is here:

• https://github.com/KEINOS/mb_levenshtein
• https://qiita.com/mpyw/items/2b636827730e06c71e3d#%E5%AE%9F%E8%A3%85 (Japanese page)

Keep this updated with features that were discussed on the mail lists.