Issue: (Not a bug) Garbled page output with PHP 7.4 (zlib extension is required)

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September 25, 2020 9:09 AM

ACL

Regular Member

(Not a bug) Garbled page output with PHP 7.4 (zlib extension is required)

On my local testing server, with XF2.1 and VW4.1.0 b001, changing to PHP 7.4 causes wiki page output to either be garbled or for placeholder text to be shown. Changing back to PHP 7.3 resolves this issue.

The garbled text seems to be limited to one Area, although the size of the wiki on my local test server is very small. This area only contains regular pages and templates. Both of those content types are affected + the Area main page. If it helps, I can create other content type pages.

I was able to create a new wiki page under PHP 7.4 and the page output is correct this time. Further revisions with PHP 7.4 are also fine. However, if I change my testing server back to PHP 7.3 and then edit the same wiki page, changing forward to PHP 7.4 will once more result in unexpected placeholder or garbled text when viewing the same wiki page.

Trying to compare two revisions displays an error: "Error: Content uses an unsupported type of compression."

There are no entries in the XenForo admin cp server error log.

Two PHP 7.3 vs 7.4 comparison screenshots have been attached to this issue

Issue Details

Issue Number 6095

Issue Type Bug

Project VaultWiki 4.x Series

Category Page Output

Status Fixed

Priority 3 - Loss of Functionality

Affected Version 4.1.0

Fixed Version 4.1.1

Milestone (none)

Software DependencyXenForo 2.x

License TypePaid

Users able to reproduce bug 0

Users unable to reproduce bug 0

Attachments 2

Assigned Users (none)

Tags (none)

September 26, 2020 1:33 AM

pegasus

VaultWiki Team

"Error: Content uses an unsupported type of compression."

The revisions created under PHP 7.3 were compressed, but your PHP 7.4 installation cannot decompress them due to missing PHP functions. Most likely this occurred because your PHP 7.3 was compiled --with-zlib and your PHP 7.4 was not. Since your existing revisions use zlib compression, you will need to continue using it.

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September 26, 2020 5:21 AM

ACL

Regular Member

Most likely this occurred because your PHP 7.3 was compiled --with-zlib and your PHP 7.4 was not.

D'oh . Thanks, you've hit the bulls eye . With the system I use for local offline testing, by default the zlib extension was included in PHP 7.3 (and earlier) but made it optional in 7.4.

So this is not a bug with VaultWiki.

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September 30, 2020 6:57 PM

pegasus

VaultWiki Team

This should be improved beginning in VaultWiki 4.1.1. Beginning in that version, VaultWiki will start tracking whenever it uses ZLIB functions, and will display prominent admin messages in various locations should this capability suddenly disappear.

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Issue: (Not a bug) Garbled page output with PHP 7.4 (zlib extension is required)

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