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PHP levenshtein() Function

PHP levenshtein() Function

The levenshtein() function in PHP calculates the Levenshtein distance between two strings.

Syntax

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

Parameter

str1(required)- This parameter signifies one of the strings being evaluated for Levenshtein distance.

str2(required)- This parameter signifies one of the strings being evaluated for Levenshtein distance.

cost_ins(optional)- This parameter specifies the cost insertion.

cost_rep(optional)- This parameter specifies the cost of replacement.

cost_del(optional)- This parameter specifies the cost of deletion.

Return

This function returns the Levenshtein-Distance between the two specified strings or returns -1, if one of the argument strings is longer than the limit of 255 characters.

Example 1

Output

1

Example 2

Output

4

Example 3

Output

120

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