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Doc Bug #79050 Levenshteins third argument not implemented and typed as string
Submitted: 2019-12-31 12:54 UTC Modified: 2021-01-01 16:14 UTC
From: php at conscribo dot nl Assigned: cmb (profile)
Status: Closed Package: Strings related
PHP Version: 7.3.13 OS: Debian
Private report: No CVE-ID: None
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 [2019-12-31 12:54 UTC] php at conscribo dot nl
Description:
------------
---
From manual page: https://php.net/function.levenshtein
---

The documentation states that arguments 3 to 5 support weights for various actions. These are not implemented (not documented).

The documentation states the weights should be integers. Running with php strict_types reveals it only accepts strings.



Test script:
---------------
<?php
declare(strict_types=1);

$str1 = 'abc';
$str2 = 'abcd';

echo levenshtein($str1, $str2, 0);

//output:
//PHP Fatal error:  Uncaught TypeError: levenshtein() expects parameter 3 to be //string, integer given 

------
<?php
declare(strict_types=1);

$str1 = 'abc';
$str2 = 'abcd';

echo levenshtein($str1, $str2, '0');

//output:
// PHP Warning:  levenshtein(): The general Levenshtein support is not there yet




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 [2019-12-31 13:44 UTC] cmb@php.net
-Status: Open +Status: Verified -Package: Documentation problem +Package: Strings related
 [2019-12-31 13:44 UTC] cmb@php.net
levenshtein() has actually three alternative signatures; the one
you're using in the test script is

  levenshtein(string $str1, string $str2, string $callback_name): int

but this signature is still not implemented (that's why you're
getting the warning).  Note that $callback_name is indeed a
string, not a callable.
 [2019-12-31 14:03 UTC] cmb@php.net
There is also the related feature request #34835.
 [2021-01-01 16:14 UTC] cmb@php.net
-Status: Verified +Status: Closed -Assigned To: +Assigned To: cmb
 [2021-01-01 16:14 UTC] cmb@php.net
Support for the third signature is completely removed as of PHP
8.0.0, so it doesn't make sense to document that signature, just
to state that it is not implemented.
 
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