YouTipPHP levenshtein() Function |
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PHP levenshtein() Function
Example
Calculate the Levenshtein distance between two strings:
<?php
echo levenshtein("Hello World","ello World");
echo "<br>";
echo levenshtein("Hello World","ello World",10,20,30);
?>Definition and Usage
The levenshtein() function returns the Levenshtein distance between two strings.
Levenshtein distance, also known as edit distance, refers to the minimum number of edit operations required to transform one string into another. The allowed edit operations include replacing a character with another, inserting a character, and deleting a character.
By default, PHP assigns the same weight to each operation (replace, insert, and delete). However, you can define the cost of each operation by setting the optional insert, replace, and delete parameters.
Note: The levenshtein() function is case-insensitive.
Note: The levenshtein() function is faster than the similar_text() function. However, the similar_text() function provides more precise results with fewer required modifications.
Syntax
levenshtein(string1, string2, insert, replace, delete)| Parameter | Description |
|---|---|
| string1 | Required. The first string to compare. |
| string2 | Required. The second string to compare. |
| insert | Optional. The cost of inserting a character. Default is 1. |
| replace | Optional. The cost of replacing a character. Default is 1. |
| delete | Optional. The cost of deleting a character. Default is 1. |
Technical Details
| Return Value: | Returns the Levenshtein distance between the two parameter strings. Returns -1 if one of the strings exceeds 255 characters. |
|---|---|
| PHP Version: | 4.0.1+ |