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Bug #43993 mb_substr_count behaves differently to substr_count with overlapping needles
Submitted: 2008-01-31 14:27 UTC Modified: 2008-08-01 23:00 UTC
From: josmessa at uk dot ibm dot com Assigned: hirokawa (profile)
Status: Closed Package: mbstring related
PHP Version: 5.2CVS-2008-01-31 (snap) OS: Windows XP SP2
Private report: No CVE-ID: None
 [2008-01-31 14:27 UTC] josmessa at uk dot ibm dot com
In the documentation for substr_count there is a note that says: "Note: This function doesn't count overlapped substrings. See the example below! ". mb_substr_count does not replicate this behaviour, and as mb_substr_count can overload substr_count I think it should.

Reproduce code:
$string_ascii = 'abcabcabc';
echo "mb_substr_count: ";
var_dump(mb_substr_count($string_ascii, 'abcabc')); //needle overlaps in haystack
echo "substr_count:    ";
var_dump(substr_count($string_ascii, 'abcabc'));

Expected result:
mb_substr_count: int(1)
substr_count:    int(1)

Actual result:
mb_substr_count: int(2)
substr_count:    int(1)


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 [2008-02-18 09:38 UTC]
If mb_substr_count() doesn't behave like substr_count() it's a problem of mbstring, not the stock PHP function..
 [2008-08-01 23:00 UTC]
This bug has been fixed in CVS.

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It is a shame that this kind of bug wasn't found for a long time..
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