levenshtein

Function • Params and return types changed in PHP 8.0

Calculate Levenshtein distance between two strings.

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2-8.3
PHP 8.4
PHP 8.5
PHP 8.6

levenshtein Function synopsis

levenshtein(
    string $string1,
    string $string2,
    int $insertion_cost = 1,
    int $replacement_cost = 1,
    int $deletion_cost = 1
  ): int

Parameters

$string1

Typestring

One of the strings being evaluated for Levenshtein distance.

$string2

Typestring

One of the strings being evaluated for Levenshtein distance.

$insertion_cost

OptionalTypeintDefault value1

Defines the cost of insertion.

$replacement_cost

OptionalTypeintDefault value1

Defines the cost of replacement.

$deletion_cost

OptionalTypeintDefault value1

Defines the cost of deletion.

Return value

Typeint

This function returns the Levenshtein-Distance between the two argument strings.

Changes to the levenshtein Function

PHP 8.0

  • Return type added: int
  • Parameter name of parameter #1 changed: $str1 to $string1
  • Parameter type added for parameter #1 ($string1): string
  • Parameter name of parameter #2 changed: $str2 to $string2
  • Parameter type added for parameter #2 ($string2): string
  • Parameter name of parameter #3 changed: $cost_ins to $insertion_cost
  • Parameter type added for parameter #3 ($insertion_cost): int
  • Parameter default value added for position #3 ($insertion_cost): 1
  • Parameter name of parameter #4 changed: $cost_rep to $replacement_cost
  • Parameter type added for parameter #4 ($replacement_cost): int
  • Parameter default value added for position #4 ($replacement_cost): 1
  • Parameter name of parameter #5 changed: $cost_del to $deletion_cost
  • Parameter type added for parameter #5 ($deletion_cost): int
  • Parameter default value added for position #5 ($deletion_cost): 1
  levenshtein(
-     $str1,
+     string $string1,
-     $str2,
+     string $string2,
-     $cost_ins,
+     int $insertion_cost = 1,
-     $cost_rep,
+     int $replacement_cost = 1,
-     $cost_del
+     int $deletion_cost = 1
-   )
+   ): int

levenshtein Function Availability

PHP VersionAvailability
PHP 8.6Upcoming Release Yes
PHP 8.5Supported (Latest) Yes
PHP 8.4Supported Yes
PHP 8.3Security-Fixes Only Yes
PHP 8.2Security-Fixes Only Yes
PHP 8.1Unsupported Yes
PHP 8.0Unsupported Yes
PHP 7.4Unsupported Yes
PHP 7.3Unsupported Yes
PHP 7.2Unsupported Yes
PHP 7.1Unsupported Yes
PHP 7.0Unsupported Yes
PHP 5.6Unsupported Yes
PHP 5.5Unsupported Yes
PHP 5.4Unsupported Yes
PHP 5.3Unsupported Yes