jfcherng / php-levenshtein-distance
Calculate the Levenshtein distance and edit progresses between two strings.
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Requires
- php: >=7.4
Requires (Dev)
- friendsofphp/php-cs-fixer: ^3.8
- liip/rmt: ^1.7
- phan/phan: ^5
- phpunit/phpunit: ^9
README
Calculate the Levenshtein distance and edit progresses between two strings. Note that if you do not need the edit path, PHP has a built-in levenshtein() function.
Features
- UTF-8-ready.
- Full edit progresses information.
Installation
$ composer require jfcherng/php-levenshtein-distance
Example
See demo.php
.
<?php include __DIR__ . '/vendor/autoload.php'; use Jfcherng\Diff\LevenshteinDistance as LD; $old = '自訂取代詞語模組'; $new = '自订取代词语模组!'; $calculator = new LD( true, // calculate edit progresses? // progress options LD::PROGRESS_OP_AS_STRING | LD::PROGRESS_PATCH_MODE ); $results = $calculator->calculate($old, $new); // this is the same but using an internal singleton $results = LD::staticCalculate( $old, // old string $new, // new string true, // calculate edit progresses? // progress options LD::PROGRESS_OP_AS_STRING | LD::PROGRESS_PATCH_MODE ); // [ // 'distance' => 5, // 'progresses' => [ // ['ins', 8, '!', 1], // ['rep', 7, '组', 1], // ['cpy', 6, '模', 1], // ['rep', 5, '语', 1], // ['rep', 4, '词', 1], // ['cpy', 3, '代', 1], // ['cpy', 2, '取', 1], // ['rep', 1, '订', 1], // ['cpy', 0, '自', 1], // ], // ] var_dump($results); $results = LD::staticCalculate( $old, // old string $new, // new string true, // calculate edit progresses? // progress options LD::PROGRESS_OP_AS_STRING | LD::PROGRESS_PATCH_MODE | LD::PROGRESS_MERGE_NEIGHBOR ); // [ // 'distance' => 5, // 'progresses' => [ // ['ins', 8, '!', 1], // ['rep', 7, '组', 1], // ['cpy', 6, '模', 1], // ['rep', 4, '词语', 2], // ['cpy', 2, '取代', 2], // ['rep', 1, '订', 1], // ['cpy', 0, '自', 1], // ], // ] var_dump($results);
Progress Options
LD::PROGRESS_NO_COPY
: Do not includeCOPY
operations in the progresses.LD::PROGRESS_MERGE_NEIGHBOR
: Merge neighbor progresses if possible.LD::PROGRESS_OP_AS_STRING
: Convert the operation in progresses from int to string.LD::PROGRESS_PATCH_MODE
: Replace the new edit position with the corresponding string.
Returned progresses
- The operation.
- The edit position for the new string.
- The edit position for the old string.
Or the corresponding string if
LD::PROGRESS_PATCH_MODE
is used. - The edit length.