The levenshtein() function returns the number of characters you need to change for two strings to be the same.

Name: The levenshtein() function returns the number of characters you need to change for two strings to be the same.
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The Levenshtein distance between two strings is the minimum number of single-character edits (insertions, deletions or substitutions) required to change one string into the other. The levenshtein() function calculates this distance.

The Levenshtein() Function Returns the Number of Characters You Need