PHP string levenshtein() Function

PHP string levenshtein() function is in-built function. It is used to calculate the distance between two strings. By default, PHP provides some operations (replace, insert and delete)

It returns the Levenshtein distance between the two argument strings or -1, if the string exceeds 255 characters.

Syntax:

int levenshtein ( string $str1 , string $str2 , int $cost_ins , int $cost_rep , int $cost_del )

Parameter	Description	Required/Optional
String1	Specify first string to compare.	required
String2	Specify second string to compare.	required
cost_ins	Specify the cost insertion.	Optional
cost_rep	Specify the cost of replacement.	Optional
cost_del	Specify the cost of deletion.	Optional

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

Example 1

<?php
// In second string ?H?  is not so it will return 1 
echo levenshtein("Hello World","ello World");
?>

Output:

Example 2

<?php
// In second string ?He?  is not so it will return 2 
echo levenshtein("Hello World","llo World");
?>

Output:

Example 3

<?php
echo levenshtein("Hello PHP","ello PHP",10,20,30);
?>

Output:

Example 4

<?php
$dist=levenshtein('javatpoint','VATPOINT');
echo "$dist";
?>

Output:

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PHP string levenshtein() Function

Syntax:

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

Example 1

Example 2

Example 3

Example 4

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