Edit report at https://bugs.php.net/bug.php?id=60314&edit=1
ID: 60314
Updated by: cmb@php.net
Reported by: gravisoft at gmail dot com
Summary: Metaphone returns fewer phonemes than defined
-Status: Open
+Status: Verified
Type: Documentation Problem
Package: Strings related
Operating System: Windows XP SP3
PHP Version: 5.3.8
-Assigned To:
+Assigned To: cmb
Block user comment: N
Private report: N
Previous Comments:
------------------------------------------------------------------------
[2011-11-17 23:13:21] felipe@php.net
Yes, in fact it isn't a phonemes limit nor an strict string limit. Because it doesn't does
wrapping in this case when it yields more than 1 char in the end.
You're right, the documentation must be updated accordially. :)
------------------------------------------------------------------------
[2011-11-17 22:39:17] gravisoft at gmail dot com
This doesn't have anything to do with it "going over" the phoneme limit parameter,
it's about it translating too few phonemes.
If you're defining (X -> KS) as one phoneme, then metpahone('axc', 3) ==
'AKS' is incorrect because it only translated (A -> A) and (X -> KS) which is two
phonemes. Translating three phonemes - (A->A), (X->KS), (C->K) - should have yielded
'AKSK'.
If you're defining each K and S from (X -> KS) as a phoneme, then metaphone('axc',
2) == 'AKS' is incorrect as per bug #60123 (going over restricted number of phoneme
characters). If that isn't a bug, then the documentation should be modified to note it as
such.
Regardless, something is amiss here.
------------------------------------------------------------------------
[2011-11-17 21:58:05] felipe@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to
report
a bug at http://bugs.php.net/how-to-report.php
It works following the Text-Metaphone CPAN package, it stop decoding when reach the limit of
phonems, but when decoding the last char it can pass the limit suplied, because this
metaphone('AX', 2) == metaphone('AXC', 3).
------------------------------------------------------------------------
[2011-11-16 20:52:15] gravisoft at gmail dot com
Description:
------------
Under certain conditions, the metaphone function returns fewer phonemes than the $phonemes parameter
specifies. This is an edge-case occurrence when dealing with an X near the end of the specified
phoneme count.
For the test script, the following phoneme transformations take place:
A -> A
X -> KS
C -> K
Test script:
---------------
<?php
var_dump('axccc', 2); // Should produce AKS
var_dump('axccc', 3); // Should produce AKSK as "X->KS" is one phoneme
var_dump('axccc', 0); // Should produce AKSKKK
?>
Expected result:
----------------
string(3) "AKS"
string(4) "AKSK"
string(6) "AKSKKK"
Actual result:
--------------
string(3) "AKS"
string(3) "AKS"
string(6) "AKSKKK"
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=60314&edit=1