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<?php declare(strict_types=1); namespace Psl\Str; use Psl; use function levenshtein as php_levenshtien; /** * Calculate Levenshtein distance between two strings. * * Note: In its simplest form the function will take only the two strings * as parameter and will calculate just the number of insert, replace and * delete operations needed to transform str1 into str2. * Note: A second variant will take three additional parameters that define * the cost of insert, replace and delete operations. This is more general * and adaptive than variant one, but not as efficient. * * @throws Psl\Exception\InvariantViolationException If neither all, or none of the costs is supplied. * * @return int this function returns the Levenshtein-Distance between the * two argument strings or -1, if one of the argument strings * is longer than the limit of 255 characters * * @pure */ function levenshtein( string $source, string $target, ?int $cost_of_insertion = null, ?int $cost_of_replacement = null, ?int $cost_of_deletion = null ): int { if (null === $cost_of_deletion && null === $cost_of_insertion && null === $cost_of_replacement) { return php_levenshtien($source, $target); } // https://github.com/php/php-src/blob/623911f993f39ebbe75abe2771fc89faf6b15b9b/ext/standard/levenshtein.c#L101 Psl\invariant( null !== $cost_of_deletion && null !== $cost_of_insertion && null !== $cost_of_replacement, 'Expected either all costs to be supplied, or non.' ); return php_levenshtien($source, $target, $cost_of_insertion, $cost_of_replacement, $cost_of_deletion); }
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