How to use php levenshtein function

The levenshtein() function is a built-in function in PHP used to calculate the Levenshtein distance between two strings. Levenshtein distance, also known as edit distance, refers to the minimum number of editing operations (replacement, insertion, deletion of a character) required between two strings to convert one string into another.

php How to use the levenshtein() function?

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 between two strings to convert one string into another. Permitted editing operations include replacing one character with another, inserting a character, and deleting a character.

By default, PHP gives equal weight to every operation (replacement, insertion, and deletion). However, you can define the cost of each operation by setting the optional insert, replace, and delete parameters.

Note: The levenshtein() function is not case-sensitive.

Syntax:

levenshtein(string1,string2,insert,replace,delete)

Parameters: The levenshtein() function accepts two required parameters and 3 optional parameters.

● String1: required. The first string to compare.​

● String2: Required. The second string to compare.

●insert: optional. The cost of inserting a character. The default is 1.

● Replace: Optional. The cost of replacing a character. The default is 1.

● delete: optional. The cost of deleting a character. The default is 1.

Return value: Returns the Levenshtein distance between the two parameter strings. If one of the strings exceeds 255 characters, it returns -1.

Let’s take a look at how to use the php levenshtein() function through an example.

Example 1

<?php
$data = "hello";
$res = "world";
echo levenshtein($data,$res);
?>

Output:

4

Example 2:

<?php
$str1 = "Learning PHP";
$str2 = "is a good choise";
echo levenshtein($str1,$str2);
?>

Output:

14

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