[pmwiki-devel] PHP upgrade error

[Petko Yotov]

Oh, this may possibly be a core bug, I'd be very interested in tracking 
it.

There is a regular expression containing minus in a character range like 
[a-z]. In these cases the minus sign means all characters after "a" 
(code point 97) and before "z" (code point 122) (like b, c,..., w, x, 
y).  If we need to match a literal dash, we place it at the start or at 
the end of the range like [-a-z].

A range like [z-a] is invalid because there are no characters that are 
at the same time after "z" (code point higher than 122) and before "a" 
(code point lower than 97).

Before PHP 7.3, such cases considered the minus to be a literal dash, 
not a range, i.e.  [z-a] only matched the characters "z", "-", "a" and 
they were silently processed, potentially unlike what the author 
intended.

Since PHP 7.3, invalid character ranges raise the warning you saw.

BTW [a-z] and [z-a] are easy to understand and fix, but I suspect the 
problem comes from something like [#%-!] or there may be an 
international character somewhere. If I have omitted to update the core, 
I'll do it, and if it is in a recipe, I can provide a fix or a 
workaround.

At your convenience, you can start with an empty config.php and 
progressively add and test all your PmWiki configurations and test the 
wiki if at any point the warning appears, see PmWiki/Troubleshooting. If 
it does, let me know. After that, start adding the recipes one after 
another, and again test every time.

Let me know of the results.

Petko

On 17/06/2021 08:27, Simon wrote:
> My ISP has just upgraded PHP
> to 7.4I thought I had everything up to date, but I see this error (and 
> not
> much of a website 
> <https://ttc.org.nz/pmwiki/pmwiki.php/TTC/ClubNight>).
> PHP Warning:  preg_replace_callback(): Compilation failed: invalid 
> range in
> character class at offset 648 in
> /home/ttcorgnz/public_html/pmwiki/pmwiki.php on line 1930
> 
> I've commented out all recipes (in cookbook) with 
> preg_replace_callback.
> It didn't fixed it.
> 
> While I try to track it down I wondered if anyone has seen something 
> similar
> 
> thanks
> 
> Simon
> 
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