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Request #67442 mbstring equivalent of `explode`
Submitted: 2014-06-14 10:00 UTC Modified: 2020-11-03 18:14 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: phpmpan at mpan dot pl Assigned:
Status: Suspended Package: mbstring related
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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From: phpmpan at mpan dot pl
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 [2014-06-14 10:00 UTC] phpmpan at mpan dot pl
Description:
------------
mbstring is missing `explode` equivalent.

• `explode` itself can't be used for the purpose, because it fails for encodings that either have no autosynchronization property (like utf16) or identical byte sequences are otherwise not uniquely mapped to characters.
• `mb_split` requires regex as its argument - hence it is unsuitable if the delimiter is not known during writing the code.
• `mb_strpos` + `mb_substr` tandem is very slow.

Test script:
---------------
function printHexString($string) {
    foreach (str_split($string) as $character) {
        echo dechex(ord($character)), ' ';
    }
    echo "\n";
}

mb_internal_encoding('utf-8'); // should match the actual encoding
$input = mb_convert_encoding('Ω☡Ω☡Ω☡☦abc', 'utf-16'); // Ω is U+2126, ☡ is U+2621
$delimiter = mb_convert_encoding('☦', 'utf-16'); // ☦ is U+2626
printHexString($input);
echo "\n";

$exploded = explode($delimiter, $input);
foreach ($exploded as $element) {
    printHexString($element);
}

Expected result:
----------------
(assuming `mb_explode` instead `explode`)
21 26 26 21 21 26 26 21 21 26 26 21 26 26 0 61 0 62 0 63 

21 26 26 21 21 26 26 21 21 26 26 21
0 61 0 62 0 63 

Actual result:
--------------
21 26 26 21 21 26 26 21 21 26 26 21 26 26 0 61 0 62 0 63 

21 
21 21 
21 21 
21 
0 61 0 62 0 63

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AllCommentsChangesGit/SVN commitsRelated reports
 [2020-11-03 18:14 UTC] cmb@php.net
-Status: Open +Status: Suspended
 [2020-11-03 18:14 UTC] cmb@php.net
This feature requires discussion for which this bug tracker is
unsuitable.  If anybody is still interested in this, please
forward the request to the internals mailing list[1].  For the
time being, I'm suspending this ticket.

[1] <https://www.php.net/mailing-lists.php#internals>
 
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