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List:       php-doc-bugs
Subject:    [DOC-BUGS] Doc #66765 [Asn->Opn]: strtr key replacing order
From:       ab () php ! net
Date:       2017-10-26 17:22:55
Message-ID: 201710261722.v9QHMtZP022602 () srgv2 ! php ! net
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Edit report at https://bugs.php.net/bug.php?id=66765&edit=1

 ID:                 66765
 Updated by:         ab@php.net
 Reported by:        pawel dot ulewicz at gmail dot com
 Summary:            strtr key replacing order
-Status:             Assigned
+Status:             Open
 Type:               Documentation Problem
 Package:            Strings related
 Operating System:   Windows 7
 PHP Version:        5.5.9
-Assigned To:        ab
+Assigned To:        
 Block user comment: N
 Private report:     N



Previous Comments:
------------------------------------------------------------------------
[2016-10-12 15:40:19] cmb@php.net

It seems to me this is a documentation issue. strtr() walks the
string from left to right, continously replacing the longest
matching sequence.

------------------------------------------------------------------------
[2014-02-28 11:45:27] ab@php.net

I can confirm that, it's across platforms

- strtr('abcdef', ['a'=> '1', 'bcde'=> '2']) works
- strtr('abcdef', ['abc'=> '1', 'bcde'=> '2']) bug

------------------------------------------------------------------------
[2014-02-24 22:26:20] pawel dot ulewicz at gmail dot com

Description:
------------
It looks like strtr function replaces strings in the following order:

1) first occurences first,
2) longest keys first.

I don't think it's a bad thing, but it doesn't work as documented. Here's the quation \
from the official docs:

"The longest keys will be tried first"

So, it's either a documentation problem or a bug.


Test script:
---------------
<?php

// expecting 'bcde' to be replaced first
echo strtr('abcdef', ['abc'=> '1', 'bcde'=> '2']) . "\n";

// the following two are replaced as expected, just to give more info
echo strtr('abcdef', ['a'=> '2', 'abc'=> '1']) . "\n";
echo strtr('abcdef', ['abcd'=> '2', 'abc'=> '1']) . "\n";


Expected result:
----------------
a2f
1def
2ef


Actual result:
--------------
1def
1def
2ef



------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=66765&edit=1

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